Knowledge check.

- Choose one best answer from given 4 choices for each questions.
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Question Number 1

The following program is used to execute a command in the OS. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include< stdio.h>
#include< stdlib.h>

int main()
{
    int files;

    printf("Executing command : 'DIR'\n");
    files = system("dirctry");

    printf("Returned value is: %d.\n", files);
    return 0;
}

files = system("dirctry");

printf("Returned value is: %d.\n", files);

#include< stdlib.h>

No change needed, program will give the correct output.

Question Number 2

The following program is used to sort an array of structures. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include< stdio.h>

{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10],temp;
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d", &num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        printf("Enter student ID: ");
        scanf("%d", &stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }

    for (i = 0; i <  num; i++)
        for (int j = 0; j <  i; j++)
            if (stud[i].studId <  stud[j].studId)
            {
                temp = stud[i];
                stud[i] = stud[j];
                stud[j] = temp;
            }

    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n",stud[i].studId);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

struct student

struct

structure student

No change needed, program will give the correct output.

Question Number 3

Which of the following sequences are not valid in C language?

#if
#else
#endif

#if
#elif
#endif

#if
#if
#endif

#if
#undef
#endif

Question Number 4

Binary operators * and / have what priority?

Same

* has greater priority than /

/ has greater priority than *

None of the above.

Question Number 5

Which of the following type specifiers are used to denote a floating point value in the scanf() function?

All of the above.

Question Number 6

The following program is used to find length of a string without using string function. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

int string_length(char[]);

int main()
{
    char str[100];
    int length;

    printf("Input a string\n");
    scanf("%s", str);
    length = string_length(str);
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length(char s[])
{
    int count = 0;

    while (s[count] != '\0')
        return count;
}

count++;

count--;

count = 0;

No change needed, program will give the correct output.

Question Number 7

int string_length(char[]);

int main()
{
    char str[100];
    int length;

    printf("Input a string\n");
    scanf("%s", str);
    length = string_length(str);
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length(char s[])
{
    int count = 0;

    count++;
    return count;
}

while (s[count] != 1)

while (s[count] != count +1)

while (s[count] != '\0')

No change needed, program will give the correct output.

Question Number 8

The following program is used to generate the palindrome of a number. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>
int main()
{
    int value,num, reverse = 0;

    printf("Enter a number to reverse : ");
    scanf("%d", &value);

    num = value;

    while (num != 0)
    {
        reverse = reverse * 10;
        reverse = reverse + num % 10;
        num = num + 10;
    }

    if (value == reverse)
        printf(" %d is a Palindrome",value);
    else
        printf(" %d is not a Palindrome", value);

    return 0;
}

num = value;

reverse = reverse * 10;

num = num + 10;

No change needed, program will give the correct output.

Question Number 9

Give the output of the following code snippet :

#define var 10

int main()
{
#if var
    printf("Hello");
#else
    printf("World");
#endif

    return 0;
}

Hello

World

No output

Compiler error

Question Number 10

The following program is used to swap two values. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include < stdio.h>
int main()
{
    int value1, value2, temp;

    printf("\nEnter the value of value1 : ");
    scanf("%d", &value1);
    printf("\nEnter the value of value2 : ");
    scanf("%d", &value2);

    printf("Before Swapping\nvalue1 = %d\nvalue2 = %d\n", value1, value2);

    temp = value1;
    value2 = temp;

    printf("After Swapping\nvalue1 = %d\nvalue2 = %d\n", value1, value2);

    return 0;
}

value1 + temp = value2;

value1 = value2;

value2/ temp = value2;

No change needed, program will give the correct output.

Question Number 11

Give the output of the following code snippet :

#define var 20;
int main()
{
    printf("%d\n", var);
}

No output

Compiler error

Question Number 12

Give the output of the following code snippet :

# define max
void Test()
{
    printf("Hello");
}
void main()
{
    max;
    Test();
}

Hello

No output

Compiler error

Garbage value

Question Number 13

The following program is used to find the maximum value in an array. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include< stdio.h>
int main()
{
    int array[100], maximum, size, count, location = 1;

    printf("\nEnter the number of elements in array : ");
    scanf("%d", &size);

    printf("Enter %d integers : ", size);

    for (count = 0; count <  size; count++)
        scanf("\n%d", &array[count]);

    maximum = array[0];
    {
        if (array[count] > maximum)
        {
            maximum = array[count];
            location = count + 1;
        }
    }

    printf("Maximum element is present at location %d and its value is %d.\n", location, maximum);
    return 0;
}

if (array[count] == maximum)

for (count = 0; count > size; count++)

for (count = 1; count < size; count++)

No change needed, program will give the correct output.

Question Number 14

The following program is used to copy strings without using string function. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

void copy_str(char[], char[]);

int main()
{
    char str[100], dest[100];

    printf("Input a string\n");
    scanf("%s",str);

    copy_str(dest, str);

    printf("Source string:      %s\n", str);
    printf("Destination string: %s\n", dest);

    return 0;
}

void copy_str(char d[], char s[])
{
    int count = 0;

    d[count] = '\0';
}

while (s[count] == '\0') { d[count] = s[count]; count++; }

while (s[count] != '\0') { d[count] = count; count--; }

while (s[count] != '\0') { d[count] = s[count]; count++; }

No change needed, program will give the correct output.

Question Number 15

What does the following segment of code do?

fprintf(fp, “Copy”);

It writes “Copy” into the file pointed by fp

It reads “Copy” from the file and prints on display.

It writes as well as reads “Copy” to and from the file and prints it.

None of the above.

Question Number 16

The following program is used to find the substring in a string without using string function. Which of the following statement(s) given in the choices should corrected to make the program compile, link and run and give the desired output?

int main()
{
    char str[100], sub[100];
    int position, length, count = 0;

    printf("Input a string  : \n");
    scanf("%s",str);

    printf("Enter the position and length of substring\n");
    scanf("%d%d", &position, &length);

    while (count <  length)
    {
        sub[count] = str[0];
        count++;
    }
    sub[count] = '\0';

    printf("Required substring is %s\n", sub);

    return 0;
}

sub[count] = '\0';

scanf("%s",str);

sub[count] = str[0];

No change needed, program will give the correct output.

Question Number 17

The following program is used to merge the contents of two files. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs2 = fopen("File2.txt", "r");

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    ft = fopen("Final.txt", "w");

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    while ((ch = fgetc(fs2)) != EOF)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

fs1 = fopen(fs2);

fs1 = fopen("File1.txt", "w");

fs1 = fopen("File1.txt", "r");

No change needed, program will give the correct output.

Question Number 18

int main()
{
    char str[100], sub[100];
    int position, length, count = 0;

    printf("Input a string  : \n");
    scanf("%c", &str);

    printf("Enter the position and length of substring\n");
    scanf("%d%d", &position, &length);

    while (count <  length)
    {
        sub[count] = str[position + count - 1];
        count++;
    }
    sub[count] = '\0';

    printf("Required substring is %s\n", sub);

    return 0;
}

printf("Input a string : \n"); scanf("%c", &str);

sub[count] = str[position + count - 1]; count++;

sub[count] = '\0';

No change needed, program will give the correct output.

Question Number 19

void copy_str(char[], char[]);

int main()
{
    char str[100], dest[100];

    printf("Input a string\n");
    scanf("%s",str);

    copy_str(dest, str);

    printf("Source string:      %s\n", str);
    printf("Destination string: %s\n", dest);

    return 0;
}

void copy_str(char d[], char s[])
{
    int count = 0;

    while (s[count] != '\0')
    {
        d[count] = s[count];
        count++;
    }
    d[count] = '\0';
}

copy_str(dest, str);

while (s[count] != '\0')

d[count] = s[count];

No change needed, program will give the correct output.

Question Number 20

#include < stdio.h>
int main()
{
    int value1, value2, temp;

    printf("\nEnter the value of value1 : ");
    scanf("%d", &value1);
    printf("\nEnter the value of value2 : ");
    scanf("%d", &value2);

    printf("Before Swapping\nvalue1 = %d\nvalue2 = %d\n", value1, value2);

    temp = value1;
    value1 = value2;
    value2 = temp;

    printf("After Swapping\nvalue1 = %d\nvalue2 = %d\n", value1, value2);

    return 0;
}

temp = value1;

value1 = value2;

value2 = temp;

No change needed, program will give the correct output.

Question Number 21

The following program is used to copy a file. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");


    return 0;
}

fclose(source); fclose(target);

fclose();

fclose(source,target);

No change needed, program will give the correct output.

Question Number 22

The following program is used to copy a file. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdlibrary.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

#include < stdlibrary.h>

fclose(source);

target = fopen("Destination.txt", "w");

No change needed, program will give the correct output.

Question Number 23

The following program is used to check if the given number is odd or even. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include < stdio.h>

int main()
{
    int value;
    printf("Enter the value to be checked : ");
    if ((value % 2) == 0)
        printf("%d is even", value);
    else
        printf("%d is odd ", value);
    return 0;
}

scanf("%d", value);

scanf("%d", &value);

if ((value / 2) == 0)

No change needed, program will give the correct output.

Question Number 24

The following program is used to compare two strings without using string function. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

int str_compare(char[], char[]);

int main()
{
    int flag;
    char str1[100], str2[100];

    printf("Input first string\n");
    scanf("%s", str1);

    printf("Input second string\n");
    scanf("%s", str2);

    flag = str_compare(str1, str2);

    if (flag == 0)
        printf("Entered strings are equal.\n");
    else
        printf("Entered strings are not equal.\n");

    return 0;

}

int str_compare(char a[], char b[])
{
    int count = 0;

    while (a[count] == b[count])
    {
        if (a[count] == '\0' || b[count] == '\0')
            break;
        count++;
    }

    if (a[count] == '\0' && b[count] == '\0')
        return 0;
    else
        continue;
}

else continue;

if (a[count] == '\0' && b[count] == '\0') return 0;

if (a[count] == '\0' || b[count] == '\0') break;

No change needed, program will give the correct output.

Question Number 25

Which pre-processor directive is used to define a symbolic constant in C :

#include

#define

#ifdef

None of the above.

Question Number 26

The following program is used to sort an array of structures. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include< stdio.h>

struct student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10],temp;
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d", &num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        printf("Enter student ID: ");
        scanf("%d", &stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }

    for (i = 0; i <  num; i++)
        for (int j = 0; j <  i; j++)
            if (struct[i].studId <  struct[j].studId)
            {
                temp = stud[i];
                stud[i] = stud[j];
                stud[j] = temp;
            }

    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n",stud[i].studId);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

if (struct[i].studId < struct[j].studId)

temp = stud[i];

for (i = 0; i < num; i++)

No change needed, program will give the correct output.

Question Number 27

The following program is used to find length of a string without using string function. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

int string_length(char[]);

int main()
{
    char str[100];
    int length;

    printf("Input a string\n");
    scanf("%s", str);
    length = string_length(str);
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length(char s[])
{
    int count = 0;

    while (s != '\0')
        count++;

    return count;
}

while (s != '\0')

length = string_length(str);

scanf("%s", str);

No change needed, program will give the correct output.

Question Number 28

The following program is used to generate the fibonacci series. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?



#include < stdio.h>

int main()
{
    int count, n, num1 = 0, num2 = 1, result = 0;
    printf("Enter number of terms: ");
    scanf("%d", &n);
    printf("Fibonacci Series:\n %d  %d  ", num1, num2);
    count = 2;
    while (count< n)
    {
        result = num1 + num2;
        ++count;
        printf("%d ", result);
    }
    return 0;
}

num1 = num2/num1;

num1 = num2; num1 = result;

num1 = num2; num2 = result;

No change needed, program will give the correct output.

Question Number 29

The following program is used to compare two strings without using string function. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

int str_compare(char[], char[]);

int main()
{
    int flag;
    char str1[100], str2[100];

    printf("Input first string\n");
    scanf("%s", str1);

    printf("Input second string\n");
    scanf("%s", str2);

    flag = str_compare(str1, str2);

    if (flag == 0)
        printf("Entered strings are equal.\n");
    else
        printf("Entered strings are not equal.\n");

    return 0;

}

int str_compare(char a[], char b[])
{
    int count = 0;

    while (a[count] == b[count])
    {
        if (a[count] == '\0' || b[count] == '\0')
            count++;
    }

    if (a[count] == '\0' && b[count] == '\0')
        return 0;
    else
        return -1;
}

break;

return 0;

continue;

No change needed, program will give the correct output.

Question Number 30

The following program is used to concatenate two strings without using string function. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

void str_cat(char[], char[]);

int main()
{
    char str1[100], str2[100];

    printf("Input a string : \n");
    scanf("%s", str1);

    printf("Input string to concatenate : \n");
    scanf("%s", str2);

    str_cat(str1, str2);

    printf("String obtained on concatenation : %s \n", str1);

    return 0;
}

void str_cat(char str1[], char str2[])
{
    int count = 0, d = 0;

    while (str1[count] != '\0')
    {
        count++;
    }
    if (str2[d] == '\0')
    {
        str1[count] = str2[d];
        d++;
        count++;
    }

    str1[count] = '\0';
}

str1[count] = str2[d];

if (str2[d] == '\0')

while (str2[d] != '\0')

No change needed, program will give the correct output.

Question Number 31

Which of the following functions are declared in the header file math.h?

sine()

isalpha()

isupper()

pow()

Question Number 32

The following program is used to copy a file. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }
    source = fopen("CopyFile.txt", "r");
    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

source = fopen("CopyFile.txt", "r");

target = fopen("Destination.txt", "w");

fclose(source);

No change needed, program will give the correct output.

Question Number 33

In printf function in C, which is the format specifier used to print decimal values?

Question Number 34

Give the output of the following code snippet :

#define CUBE(p)(p*p*p);
void main()
{
    int a=3,b=10,c=5;
    int x=CUBE(a);
    int y=CUBE(b+c);
    printf("%d %d",x,y);
}

27 125

27 115

36 125

Compilation error

Question Number 35

The following program is used to check if the given number is a prime number or not. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include< stdio.h>

int main()
{
    int value, i, flag = 0;
    printf("Enter a positive value: ");
    scanf("%d", &value);
    for (i = 2; i < = value / 2; ++i)
    {
        if (value % i == 0)
        {
            break;
        }
    }
    if (flag == 0)
        printf("%d is a prime number", value);
    else
        printf("%d is not a prime number", value);
    return 0;
}

flag = flag/2;

flag = value ;

flag = 1;

No change needed, program will give the correct output.

Question Number 36

Which of the following is a valid variable initialization :

char esc='\\';

int x =10;

float escape= 2.0e-5;

All of the above.

Question Number 37

Give the output of the following code snippet :

int main()
{
    const int a = 10;
    printf("%d ",a);
    a=12;
    printf("%d\n",a);
    return 0;
}

10 12

10 0

0 12

Compiler error

Question Number 38

Which of the following fall under the category of additive operators?

Both 1 and 2

Question Number 39

Give the output of the following code snippet :

#define CUBE(x)((x)*(x)*(x))
void fun()
{
    int x=2,y=1;
    int z=CUBE(++x + --y);
    printf("%d ",y);
}
void main()
{
    int a=3,b=10,c=5;
    int d;
    fun();
    b=CUBE(a+3)/b+c-a;
    printf("%d",b);
}

10 24

-1 18

-2 23

Compilation error

Question Number 40

Give the output of the following code :


#define Message "Hello World"

int main()
{

    printf("%d\n",Message);
    return 0;
}

Hello World

Compiler error

No output

Garbage value

Question Number 41

The ungetc() function can be used only with getc () : True or false.

Always true.

Always false.

Sometimes true and sometimes false.

No sufficient information to provide an accurate answer.

Question Number 42

In printf function in C, which is the format specifier used to print hexadecimal values?

Question Number 43

What are the qualifiers that can be applied to an integer data type in C?

short

unsigned

signed

All of the above.

Question Number 44

A character constant in C is an integer, with a single character within:

" "

' '

None of the above.

Question Number 45

The following program is used to copy strings without using string function. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

void copy_str(char[], char[]);

int main()
{
    char str[100], dest[100];

    printf("Input a string\n");
    scanf("%s",str);

    copy_str(str);

    printf("Source string:      %s\n", str);
    printf("Destination string: %s\n", dest);

    return 0;
}

void copy_str(char d[], char s[])
{
    int count = 0;

    while (s[count] != '\0')
    {
        d[count] = s[count];
        count++;
    }
    d[count] = '\0';
}

d[count] = s[count];

copy_str(str);

d[count] = '\0';

No change needed, program will give the correct output.

Question Number 46

The following program is used to merge the contents of two files. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs1 = fopen("File1.txt", "r");
    fs2 = fopen("File2.txt", "r");

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    while ((ch = fgetc(fs2)) != EOF)
        fputc(ch, ft);

    ft = fopen("Final.txt", "w");

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

fs1 = fopen("File1.txt", "r"); fs2 = fopen("File2.txt", "r");

while ((ch = fgetc(fs1)) != EOF) fputc(ch, ft);

ft = fopen("Final.txt", "w");

No change needed, program will give the correct output.

Question Number 47

void str_cat(char[], char[]);

int main()
{
    char str1[100], str2[100];

    printf("Input a string : \n");
    scanf("%s", str1);

    printf("Input string to concatenate : \n");
    scanf("%s", str2);

    str_cat();

    printf("String obtained on concatenation : %s \n", str1);

    return 0;
}

void str_cat(char str1[], char str2[])
{
    int count = 0, d = 0;

    while (str1[count] != '\0')
    {
        count++;
    }
    while (str2[d] != '\0')
    {
        str1[count] = str2[d];
        d++;
        count++;
    }

    str1[count] = '\0';
}

str_cat();

void str_cat(char[], char[]);

str1[count] = str2[d];

No change needed, program will give the correct output.

Question Number 48

Which of the following statements is true about a character constant in C :

It is an integer value.

It is written as a single character within single quotes.

The value of the constant is the numeric value of the character in the machine's character set.

All of the above.

Question Number 49

int string_length(char[]);

int main()
{
    char str[100];
    int length;

    printf("Input a string\n");
    scanf("%s", str);
    length = string_length(str);
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length(char s[])
{
    int count = 0;

    while (s[count] != s[count+1])
        count++;

    return count;
}

length = string_length(str);

while (s[count] != s[count+1])

count++;

No change needed, program will give the correct output.

Question Number 50

#include< stdio.h>

struct student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10],temp;
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d", &num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        printf("Enter student ID: ");
        scanf("%d", &stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }

    for (i = 0; i <  num; i++)
        for (int j = 0; j <  i; j++)
            if (stud.studId <  stud.studId)
            {
                temp = stud[i];
                stud[i] = stud[j];
                stud[j] = temp;
            }

    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n",stud[i].studId);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

for (i = 0; i < num; i++)

for (int j = 0; j < i; j++)

if (stud.studId < stud.studId)

No change needed, program will give the correct output.

Question Number 51

The following program is used to check if the given number is a prime number or not. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include< stdio.h>

int main()
{
    int value, i, flag = 0;
    printf("Enter a positive value: ");
    scanf("%d", &value);
    for (i = 2; i < = value / 2; ++i)
    {
        if (value / i == 0)
        {
            flag = 1;
            break;
        }
    }
    if (flag == 0)
        printf("%d is a prime number", value);
    else
        printf("%d is not a prime number", value);
    return 0;
}

scanf("%d", &value);

if (value / i == 0)

if (flag == 0)

No change needed, program will give the correct output.

Question Number 52

The following program is used to find the factorial of a number. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>

int main()
{
    int n, count;
    int fact = 0;
    printf("Enter a value: ");
    scanf("%d", &n);
    if (n<  0)
        printf("Factorial of negative number does not exist");
    else
    {
        for (count = 1; count < = n; ++count)
        {
            fact = fact * count;
        }
        printf("Factorial of %d is %d ",n,fact);
    }
    return 0;
}

int fact = 0;

scanf("%d", &n);

fact = fact * count;

No change needed, program will give the correct output.

Question Number 53

Give the output of the following code snippet :

int main()
{
    int i = 10, j = 20, k = 30;
    printf("%d %d ", i, j, k);
}

10 20 30

10 20

10 20 0

Compilation error

Question Number 54

What is the purpose of sprintf?

It obtains the data into standard input stream.

It writes the formatted output into a string

It writes the formatted output data into a file

Both 1 and 3

Question Number 55

#include < stdio.h>
int main()
{
    int value,num, reverse = 0;

    printf("Enter a number to reverse : ");
    scanf("%d", &value);

    num = value;

    while (num != 0)
    {
        reverse = reverse * 10;
        reverse = reverse + num - 10;
        num = num / 10;
    }

    if (value == reverse)
        printf(" %d is a Palindrome",value);
    else
        printf(" %d is not a Palindrome", value);

    return 0;
}

num = value;

reverse = reverse % 10;

reverse = reverse + num - 10;

No change needed, program will give the correct output.

Question Number 56

The following program is used to add two complex numbers by passing structure to a function. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

struct complex
{
    float real;
    float imag;
};
struct complex Add(struct complex n1, struct complex n2);
int main()
{
    struct complex n1, n2, temp;
    printf("For first complex number : \n");
    printf("Enter real part :\n");
    scanf("%f", &n1.real);
    printf("Enter imaginary part :\n");
    scanf("%f", &n1.imag);
    printf("For second complex number : \n");
    printf("Enter real part :\n");
    scanf("%f", &n2.real);
    printf("Enter imaginary part :\n");
    scanf("%f", &n2.imag);
    temp = Add(n1, n2);
    printf("Sum=%.1f+%.1fi", temp.real, temp.imag);
    return 0;
}
struct complex Add(struct complex n1, struct complex n2)
{
    int temp;
    temp.real = n1.real + n2.real;
    temp.imag = n1.imag + n2.imag;
    return(temp);
}

int temp;

temp.real = n1.real + n2.real;

temp.imag = n1.imag + n2.imag;

No change needed, program will give the correct output.

Question Number 57

Which of the following are format specifiers in C?

All of the above.

Question Number 58

#include< stdio.h>

struct student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10],temp;
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d", &num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        printf("Enter student ID: ");
        scanf("%d", &stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }

    for (i = 0; i <  num; i++)
        for (int j = 0; j <  i; j++)
            if (stud[i].studId <  stud[j].studId)
            {
                temp = stud[i];
                stud[i] = stud[j];
                stud[j] = temp[j];
            }

    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n",stud[i].studId);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

stud[j] = temp[j];

temp = stud[i];

stud[i] = stud[j];

No change needed, program will give the correct output.

Question Number 59

The following program is used to copy strings without using string function. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

void copy_str(char[], char[]);

int main()
{
    char str[100], dest[100];

    printf("Input a string\n");
    scanf("%s",str);

    copy_str(dest, str);

    printf("Source string:      %s\n", str);
    printf("Destination string: %s\n", dest);

    return 0;
}

void copy_str(char d[], char s[])
{
    int count = 0;
    d[count] = '\0';

    while (s[count] != '\0')
    {
        d[count] = s[count];
        count++;
    }
}

d[count] = s[count];

count++;

d[count] = '\0';

No change needed, program will give the correct output.

Question Number 60

Which of the following represents the function for scanf?

void scanf(char *format, …)

int scanf(char *format, …)

char scanf(int format, …)

char *scanf(char *format, …)

Question Number 61

A user defined header file is generally specified using :

< >

" "

()

All of the above.

Question Number 62

Which of the following fall under the category of multiplicative operators?

All of the above

Question Number 63

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs1 = fopen("File1.txt", "r");
    fs2 = fopen("File2.txt", "r");
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    ft = fopen("Final.txt", "w");

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    while ((ch = fgetc(fs2)) != EOF)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

if (fs1 == NULL || fs2 == NULL)

if (fs1 == 0 || fs2 == 0)

if (fs1 == fs2)

No change needed, program will give the correct output.

Question Number 64

#include< stdio.h>

struct student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10],temp;
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d", &num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        printf("Enter student ID: ");
        scanf("%d", &stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }

    for (i = 0; i <  num; i++)
        for (int j = 0; j <  i; j++)
            if (stud[i].studId <  stud[j].studId)
            {
                stud[j] = temp;
            }

    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n",stud[i].studId);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

temp = stud[j]; stud[i++] = stud[j];

temp = stud[i]; stud[i] = stud[j];

temp = stud; stud = stud[i];

No change needed, program will give the correct output.

Question Number 65

The following program is used to delete an element from an array. Which of the following statement(s) given in the choices should be removed to make the program compile, link and run and give the desired output?

#include< stdio.h>
int main()
{
    int array[100], position, count, n;

    printf("Enter number of elements in array : \n");
    scanf("%d", &n);

    printf("Enter %d elements : \n", n);

    for (count = 0; count <  n; count++)
        scanf("%d", &array[count]);

    printf("Enter the location where you wish to delete element : \n");
    scanf("%d", &position);

    if (position >= n + 1)
        printf("Deletion not possible.\n");
    else
    {
        for (count = position - 1; count <  n - 1; count++)
            if (array[i+1] == array[count + 1])
                array[count] = array[count + 1];

        printf("Resultant array : ");

        for (count = 0; count <  n - 1; count++)
            printf("%d\n", array[count]);
    }

    return 0;
}

for (count = position - 1; count < n - 1; count++)

if (array[i+1] == array[count + 1])

array[count] = array[count + 1];

No change needed, program will give the correct output.

Question Number 66

The following program is used to add two distances ( inch to feet ) using structures. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

struct Distance
{
    int feet;
    float inch;
};
struct Distance dist1, dist2, sum;

void main()
{
    printf("Enter information for 1st distance\n");
    printf("Enter feet: ");
    scanf("%d", &dist1.feet);
    printf("Enter inch: ");
    scanf("%f", &dist1.inch);
    printf("\nEnter information for 2nd distance\n");
    printf("Enter feet: ");
    scanf("%d", &dist2.feet);
    printf("Enter inch: ");
    scanf("%f", &dist2.inch);
    sum.feet = dist1.feet;
    sum.inch = dist1.inch;

    if (sum.inch>12.0)
    {
        sum.inch = sum.inch - 12.0;
        ++sum.feet;
    }
    printf("\nSum of distances=%d\'-%.1f\"", sum.feet, sum.inch);
}

sum.feet = dist1.feet; sum.inch = dist1.inch;

sum.inch = sum.inch - 12.0;

struct Distance dist1, dist2, sum;

No change needed, program will give the correct output.

Question Number 67

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    ft = fopen("Final.txt", "w");

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    while ((ch = fgetc(fs2)) != EOF)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

fs1 = fopen("File1.txt", "r"); fs2 = fopen("File2.txt", "r");

fs1 = fileopen("File1.txt", "r"); fs2 = fileopen("File2.txt", "r");

fs1 = fopn("File1.txt", "r"); fs2 = fopn("File2.txt", "r");

No change needed, program will give the correct output.

Question Number 68

Give the output of the following code snippet :

void main()
{
    short int x;
    long int y;
    if(sizeof(x)==sizeof(y))
        printf("Hello");
    else
        printf("World");
}

Hello

World

No output

Compilation error

Question Number 69

void copy_str(char[], char[]);

int main()
{
    char str[100], dest[100];

    printf("Input a string\n");
    scanf("%s",str);

    printf("Source string:      %s\n", str);
    printf("Destination string: %s\n", dest);

    return 0;
}

void copy_str(char d[], char s[])
{
    int count = 0;

    while (s[count] != '\0')
    {
        d[count] = s[count];
        count++;
    }
    d[count] = '\0';
}

copy_str(dest, str);

copy_str(dest);

copy_str(str);

No change needed, program will give the correct output.

Question Number 70

#include< stdio.h>
#include< stdlib.h>

int main()
{
    int files;

    printf("Executing command : 'DIR'\n");
    files = system("dir");

    printf("Returned value is: %d.\n", files);
    return 0;
}

files = system("dir");

printf("Returned value is: %d.\n", files);

#include< stdlib.h>

No change needed, program will give the correct output.

Question Number 71

int str_compare(char[], char[]);

int main()
{
    int flag;
    char str1[100], str2[100];

    printf("Input first string\n");
    scanf("%s", str1);

    printf("Input second string\n");
    scanf("%s", str2);

    flag = str_compare(str1, str2);

    if (flag == '\0')
        printf("Entered strings are equal.\n");
    else
        printf("Entered strings are not equal.\n");

    return 0;

}

int str_compare(char a[], char b[])
{
    int count = 0;

    while (a[count] == b[count])
    {
        if (a[count] == '\0' || b[count] == '\0')
            break;
        count++;
    }

    if (a[count] == '\0' && b[count] == '\0')
        return 0;
    else
        return -1;
}

if (flag == '\0')

while (a[count] == b[count])

if (a[count] == '\0' && b[count] == '\0')

No change needed, program will give the correct output.

Question Number 72

Give the output of the following code snippet :

void main()
{
    float double x;
    x=100.50;
    x++;
    printf("%d",x);
}

100.50

100

101.50

Compilation error

Question Number 73

Give the output of the following code snippet :

#define join(p,q) p##q
int main()
{
    int join(a,b)=45;
    printf("%d",ab);
    return 0;
}

No output

Compiler error

Question Number 74

The following program is used to delete an element from an array. Which of the following statement(s) given in the choices should be corrected and removed to make the program compile, link and run and give the desired output?

#include< stdio.h>
int main()
{
    int array[100], position, count, n;

    printf("Enter number of elements in array : \n");
    scanf("%d", &n);

    printf("Enter %d elements : \n", n);

    for (count = 0; count <  n; count++)
        scanf("%d", &array[count]);

    printf("Enter the location where you wish to delete element : \n");
    scanf("%d", &position);

    if (position >= n + 1)
        printf("Deletion not possible.\n");
    else
    {
        for (count = position - 1; count <  n - 1; count++)
            for (j = position - 1; j <  n - 1; j++)
                array[count] = array[j];

        printf("Resultant array : ");

        for (count = 0; count <  n - 1; count++)
            printf("%d\n", array[count]);
    }

    return 0;
}

for (j = position - 1; j < n - 1; j++) array[count] = array[j];

printf("Enter the location where you wish to delete element : \n"); scanf("%d", &position);

if (position >= n + 1) printf("Deletion not possible.\n");

No change needed, program will give the correct output.

Question Number 75

The following program is used to find the GCD and LCM of two numbers. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x;
    b = y;
    gcd = a;

    while (b != 0)
    {
        temp = b;
        b = a % b;
        a = temp;
    }
    lcm = (x*y) / gcd;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

b = a % b;

a = temp;

gcd = a;

No change needed, program will give the correct output.

Question Number 76

Give the output of the following code snippet :

#define MAN(x, y) ((x)>(y)) ? (x):(y);

int main()
{
    int i=10, j=5, k=0;
    k = MAN(i, j);
    printf("%d, %d, %d\n", i, j, k);
    return 0;
}

10, 5, 0

10,5, 10

10 ,0, 0

No output

Question Number 77

Give the output of the following code snippet:

void main()
{
    printf("Print value   %d", 12.8);
}

Print value 12

Print value 12.8

Print value 0

None of the above

Question Number 78

#include < stdio.h>

int main()
{
    int n, count;
    int fact = 1;
    printf("Enter a value: ");
    scanf("%d", &n);
    if (n<  0)
        printf("Factorial of negative number does not exist");
    else
    {
        for (count = 0; count < = n; ++count)
        {
            fact = fact * count;
        }
        printf("Factorial of %d is %d ",n,fact);
    }
    return 0;
}

if (n> 0)

fact = fact * count;

for (count = 0; count < = n; ++count)

No change needed, program will give the correct output.

Question Number 79

The following program is used to merge two arrays into a single array. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

void MergeArrays (int[], int, int[], int, int[]);

int main()
{
    int arry1[100], arry2[100], num1, num2, c, result[200];

    printf("Input number of elements in first array\n");
    scanf("%d", &num1);

    printf("Input %d integers\n", num1);
    for (c = 0; c <  num1; c++)
    {
        scanf("%d", &arry1[c]);
    }

    printf("Input number of elements in second array\n");
    scanf("%d", &num2);

    printf("Input %d integers\n", num2);
    for (c = 0; c <  num2; c++)
    {
        scanf("%d", &arry2[c]);
    }

    MergeArrays(arry1, num1, arry2, num2, result);

    printf("Result array:\n");

    for (c = 0; c <  num1 + num2; c++)
    {
        printf("%d\n", result[c]);
    }
    return 0;
}

void MergeArrays (int arry1[], int num1, int arry2[], int num2, int result[])
{
    int i, j, k;
    j = k = 0;

    for (i = 0; i <  num1 + num2;)
    {
        if (j == num1 && k == num2)
        {

            if (arry1[j] <  arry2[k])
            {
                result[i] = arry1[j];
                j++;
            }
            else
            {
                result[i] = arry2[k];
                k++;
            }
            i++;
        }

        else if (j == num1)
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry2[k];
                k++;
                i++;
            }
        }

        else
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry1[j];
                j++;
                i++;
            }
        }
    }
}

for (i = 0; i < num1 + num2;)

if (j == num1 && k == num2)

if (arry1[j] < arry2[k])

No change needed, program will give the correct output.

Question Number 80

int str_compare(char[], char[]);

int main()
{
    int flag;
    char str1[100], str2[100];

    printf("Input first string\n");
    scanf("%s", str1);

    printf("Input second string\n");
    scanf("%s", str2);

    flag = str_compare();

    if (flag == 0)
        printf("Entered strings are equal.\n");
    else
        printf("Entered strings are not equal.\n");

    return 0;

}

int str_compare(char a[], char b[])
{
    int count = 0;

    while (a[count] == b[count])
    {
        if (a[count] == '\0' || b[count] == '\0')
            break;
        count++;
    }

    if (a[count] == '\0' && b[count] == '\0')
        return 0;
    else
        return -1;
}

if (a[count] == '\0' && b[count] == '\0')

flag = str_compare();

int str_compare();

No change needed, program will give the correct output.

Question Number 81

The following program is used to merge the contents of two files. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs1 = fopen("File1.txt", "r");
    fs2 = fopen("File2.txt", "r");

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    ft = fopen("Final.txt", "w");

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    if ((ch = fgetc(fs2)) != -1)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

fs2 = fopen("File2.txt", "r");

if (ft == NULL)

if ((ch = fgetc(fs2)) != -1)

No change needed, program will give the correct output.

Question Number 82

The following program is used to concatenate two strings without using string function. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

void str_cat(char[], char[]);

int main()
{
    char str1[100], str2[100];

    printf("Input a string : \n");
    scanf("%s", str1);

    printf("Input string to concatenate : \n");
    scanf("%s", str2);

    str_cat(str1, str2);

    printf("String obtained on concatenation : %s \n", str1);

    return 0;
}

void str_cat(char str1[], char str2[])
{
    int count = 0, d = 0;

    while (str1[count] != '\0')
    {
        count++;
    }
    while (str2[d] != '\0')
    {
        count++;
    }

    str1[count] = '\0';
}

str1[count] = str2[d]; d++;

str1[count] = str[count+1]; d++;

str1[count] = str2[d]; d--;

No change needed, program will give the correct output.

Question Number 83

Give the output of the following code snippet :

void main()
{
    float x = 0.1;
    printf("%d, ", x);
    printf("%f", x);
}

0 0.1

0 0.100000

Garbage value 0.100000

No output

Question Number 84

Which of the following are types of C constants ?

Integer constants

String constants.

Octal / Hexadecimal constants

All of the above.

Question Number 85

Which of the following is a ternary operator?

>>=

Question Number 86

Which of the following statements is true about minprintf() functions in C :

minprint() does not return the number of characters printed.

minprintf() perform similar functions to printf().

minprintf() is used when the number of arguments is not known.

All of the above.

Question Number 87

The following program is used to merge two arrays into a single array. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

void MergeArrays (int[], int, int[], int, int[]);

int main()
{
    int arry1[100], arry2[100], num1, num2, c, result[200];

    printf("Input number of elements in first array\n");
    scanf("%d", &num1);

    printf("Input %d integers\n", num1);
    for (c = 0; c <  num1; c++)
    {
        scanf("%d", &arry1[c]);
    }

    printf("Input number of elements in second array\n");
    scanf("%d", &num2);

    printf("Input %d integers\n", num2);
    for (c = 0; c <  num2; c++)
    {
        scanf("%d", &arry2[c]);
    }

    MergeArrays(arry1, num1, arry2, num2, result);

    printf("Result array:\n");

    for (c = 0; c <  num1 + num2; c++)
    {
        printf("%d\n", result[c]);
    }
    return 0;
}

void MergeArrays (int arry1[], int num1, int arry2[], int num2, int result[])
{
    int i, j, k;
    j = k = 0;

    for (i = 0; i <  num1 + num2;)
    {
        if (j <  num1 && k <  num2)
        {

            if (arry1[j] <  arry2[k])
            {
                result[i] = arry1[j];
                j++;
            }
            else
            {
                result[i] = arry2[k];
                k++;
            }
            i++;
        }

        else if (j == num1)
        {
            for (; i <  num1 + num2;)
            {
                i++;
            }
        }

        else
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry1[j];
                j++;
                i++;
            }
        }
    }
}

result[i] = arry2[k]; k -- ;

result[i] = arry2[k]; k++;

result[k + 1] = arry2[k]; k++;

No change needed, program will give the correct output.

Question Number 88

The following program is used to print the IP address of the system. Which of the following statement(s) given in the choices should be added to make the program compile, link and run and give the desired output?

#include < stdio.h>
#include < stdlib.h>


int main()
{
    return 0;
}

system("C:\\WINDOWS\\System32\\ip ");

system("C:\\WINDOWS\\System32\\IPConfig ");

system("C:\\WINDOWS\\System32\\ipconfig ");

No change needed, program will give the correct output.

Question Number 89

Give the output of the following code snippet :

int x;
float y;
void main()
{

    printf("%d %.2f",x,y);
}

0 0.00

Garbage values

No output

Compilation error

Question Number 90

Give the output of the following code snippet :

int main()
{
    char c = 'H';
    putchar(c);
}

Output 'H' is printed on the screen.

No output

Compiler error.

Garbage value

Question Number 91

The conditional directives #if and #ifdef perform the same operations. State true or false.

Always true

Always false

Sometimes true and sometimes false.

Not enough information to provide the accurate answer.

Question Number 92

The following program is used to add two complex numbers by passing structure to a function. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

struct complex
{
    float real;
    float imag;
};
struct complex Add(struct complex n1, struct complex n2);
int main()
{
    struct complex n1, n2, temp;
    printf("For first complex number : \n");
    printf("Enter real part :\n");
    scanf("%f", &n1.real);
    printf("Enter imaginary part :\n");
    scanf("%f", &n1.imag);
    printf("For second complex number : \n");
    printf("Enter real part :\n");
    scanf("%f", &n2.real);
    printf("Enter imaginary part :\n");
    scanf("%f", &n2.imag);
    printf("Sum=%.1f+%.1fi", temp.real, temp.imag);
    return 0;
}
struct complex Add(struct complex n1, struct complex n2)
{
    struct complex temp;
    temp.real = n1.real + n2.real;
    temp.imag = n1.imag + n2.imag;
    return(temp);
}

temp = Add(complex n1, complex n2);

temp = Add();

temp = Add(n1, n2);

No change needed, program will give the correct output.

Question Number 93

The following program is used to find the maximum value in an array. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include< stdio.h>
int main()
{
    int array[100], maximum, size, count, location = 1;

    printf("\nEnter the number of elements in array : ");
    scanf("%d", &size);

    printf("Enter %d integers : ", size);

    for (count = 0; count <  size; count++)
        scanf("\n%d", &array[count]);

    maximum = array[0];

    for (count = 1; count <  size; count++)
    {
        if (array[count] > maximum)
        {
            size = array[count];
            location = count + 1;
        }
    }

    printf("Maximum element is present at location %d and its value is %d.\n", location, maximum);
    return 0;
}

size = array[count];

location = count + 1;

for (size = 1; count < size; size ++)

No change needed, program will give the correct output.

Question Number 94

Which of the following are conditional directives in C?

#ifdef

#include

#define

All of the above

Question Number 95

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs1 = fopen("File1.txt", "r");

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    ft = fopen("Final.txt", "w");

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    while ((ch = fgetc(fs2)) != EOF)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

fs2 = fopen("File2.txt", "r");

fs2 = fopen("File2.txt");

fs2 = fopen("r");

No change needed, program will give the correct output.

Question Number 96

The following program is used to copy a file. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }
    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

while ((ch = fgetc(source)) != EOF) fputc(ch, target);

target = fopen("Destination.txt", "w");

printf("Press any key to exit...\n"); exit(EXIT_FAILURE);

No change needed, program will give the correct output.

Question Number 97

A leading 0x on an integer constant is used to denote:

octal

hexadecimal

long

None of the above.

Question Number 98

Give the output of the following code snippet :

#define GT >
#define LT <
#define AND &&
#define OR ||
void main()
{
    int x=100,y=200,z=300;
    if(((x + y GT z) == 0) OR ((x +y LT z) ==0))
        printf("%d",x+y+z);
    else
        printf("%d",z-y-x);
}

600

Compilation error

No output

Question Number 99

Give the output of the following code snippet :

void main()
{
    int k = 8;
    int m = 7;
    int z = k <  m ? k = m : m++;
    printf("%d", z);
}

No output

Compiler error

Question Number 100

void str_cat(char[], char[]);

int main()
{
    char str1[100], str2[100];

    printf("Input a string : \n");
    scanf("%s", str1);

    printf("Input string to concatenate : \n");
    scanf("%s", str2);

    str_cat(str1, str2);

    printf("String obtained on concatenation : %s \n", str1);

    return 0;
}

void str_cat(char str1[], char str2[])
{
    int count = 0, d = 0;

    while (str1[count] == '\0')
    {
        count++;
    }
    while (str2[d] != '\0')
    {
        str1[count] = str2[d];
        d++;
        count++;
    }

    str1[count] = '\0';
}

while (str1[count] == '\0')

while (str2[d] != '\0')

str1[count] = '\0';

No change needed, program will give the correct output.

Question Number 101

The following program is used to find length of a string without using string function. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

int string_length(char[]);

int main()
{
    char str[100];
    int length;
    length = string_length(str);
    printf("Input a string\n");
    scanf("%s", str);
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length(char s[])
{
    int count = 0;

    while (s[count] != '\0')
        count++;

    return count;
}

return count;

length = string_length(str);

int string_length(char[]);

No change needed, program will give the correct output.

Question Number 102

Give the output of the following code snippet :

void main()
{
    int x=3,y=6;
    double z=fmod((double)x,(double)y);
    printf("%.2f",z);
}

3.00

Compilation error

Question Number 103

Which of the following statements is true about the ferror() function in C?

Tests the error indicator for the given stream.

Returns non-zero value if end of file has occurred.

It is analogous to feof() function.

All of the above.

Question Number 104

What happens when we use?

fprintf(stderr, “error: could not open file”);

The diagnostic output is directly displayed in the output.

The diagnostic output is pipelined to the output file.

The line which caused error is compiled again.

The program is immediately aborted.

Question Number 105

The following program is used to reverse a string. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>
#include < string.h>

int main()
{
    char str[100], reverse[100];
    int strlength, count, d;

    printf("Input a string\n");
    scanf("%s",str);
    strlength = strlen(str);

    for (count = strlength - 1, d = 0; count >= 0; count--, d++)
        reverse[count + 1] = str[d + 1];

    reverse[d] = '\0';
    printf("%s\n", reverse);
    return 0;
}

reverse[d] = '\0';

for (count = strlength - 1, d = 0; count >= 0; count--, d++)

reverse[count + 1] = str[d + 1];

No change needed, program will give the correct output.

Question Number 106

Give the output of the following code snippet :

int main()
{
    static int a;
    printf("%d\n",a);
    return 0;
}

Garbage value

Compiler error.

Question Number 107

The syntax to print a % using printf statement can be done by.

"%"

Question Number 108

void MergeArrays (int[], int, int[], int, int[]);

int main()
{
    int arry1[100], arry2[100], num1, num2, c, result[200];

    printf("Input number of elements in first array\n");
    scanf("%d", &num1);

    printf("Input %d integers\n", num1);
    for (c = 0; c <  num1; c++)
    {
        scanf("%d", &arry1[c]);
    }

    printf("Input number of elements in second array\n");
    scanf("%d", &num2);

    printf("Input %d integers\n", num2);
    for (c = 0; c <  num2; c++)
    {
        scanf("%d", &arry2[c]);
    }

    MergeArrays(arry1, num1, arry2, num2, result);

    printf("Result array:\n");

    for (c = 0; c <  num1 + num2; c++)
    {
        printf("%d\n", result[c]);
    }
    return 0;
}

void MergeArrays (int arry1[], int num1, int arry2[], int num2, int result[])
{
    int i, j, k;
    j = k = 0;

    for (i = 0; i <  num1 + num2;)
    {
        if (j <  num1 && k <  num2)
        {

            if (arry1[j] <  arry2[k])
            {
                result[i] = arry1[j];
                j++;
            }
            else
            {
                result[i] = arry2[k];
                k++;
            }
            i++;
        }

        else if (j == num1)
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry2[k];
                k++;
                i++;
            }
        }

        else
        {
            for (; i <  num1 + num2;)
            {
                result[j] = arry2[k];
                k++;
                i++;
            }
        }
    }
}

result[j] = arry2[k]; k++;

result[i] = arry2[k]; k++;

if (j < num1 && k < num2)

No change needed, program will give the correct output.

Question Number 109

Which keyword specifies the range of positive and negative values that can be assigned for the character data type?

long

signed

short

All of the above

Question Number 110

What is the value obtained when the sizeof operator is applied to a char?

Question Number 111

The following program is used to find the maximum value in an array. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

#include< stdio.h>
int main()
{
    int array[100], maximum, size, count, location = 1;

    printf("\nEnter the number of elements in array : ");
    scanf("%d", &size);

    printf("Enter %d integers : ", size);

    for (count = 0; count <  size; count++)
        scanf("\n%d", &array[count]);

    maximum = array[0];

    for (count = 1; count <  size; count++)
    {
        if (array[count] > maximum)
        {
            location = count + 1;
        }
        maximum = array[count];
    }


    printf("Maximum element is present at location %d and its value is %d.\n", location, maximum);
    return 0;
}

if (array[count] > maximum)

maximum = array[0];

maximum = array[count];

No change needed, program will give the correct output.

Question Number 112

void copy_str(char[], char[]);

int main()
{
    char str[100], dest[100];

    printf("Input a string\n");
    scanf("%s",str);

    copy_str(dest, str);

    printf("Source string:      %s\n", str);
    printf("Destination string: %s\n", dest);

    return 0;
}

void copy_str(char d[], char s[])
{
    int count = 0;

    while (s[count] != '\0')
    {
        count++;
    }
    d[count] = '\0';
}

d[count] = s[count-1];

d[count] = s[count+1];

d[count] = s[count];

No change needed, program will give the correct output.

Question Number 113

Which of the following are types of C constants ?

Enumeration constants

Real or floating point constants.

Octal / Hexadecimal constants

All of the above.

Question Number 114

#include< stdio.h>
int main()
{
    int array[100], maximum, size, count, location = 1;

    printf("\nEnter the number of elements in array : ");
    scanf("%d", &size);

    printf("Enter %d integers : ", size);

    for (count = 0; count <  size; count++)
        scanf("\n%d", &array[count]);

    maximum = array[0];

    for (size = 1; count <  size; size ++)
    {
        if (array[count] > maximum)
        {
            maximum = array[count];
            location = count + 1;
        }
    }

    printf("Maximum element is present at location %d and its value is %d.\n", location, maximum);
    return 0;
}

maximum = array[count];

location = count + 1;

for (size = 1; count < size; size ++)

No change needed, program will give the correct output.

Question Number 115

Give the output of the following code snippet :

void main()
{

    printf("%d %d",printf("Hello World "));

}

Hello World 10 0

Hello World 12 Garbage value

Hello World 12 0

Compilation error

Question Number 116

#include< stdio.h>
int main()
{
    int array[100], position, count, n;

    printf("Enter number of elements in array : \n");
    scanf("%d", &n);

    printf("Enter %d elements : \n", n);

    for (count = 0; count <  n; count++)
        scanf("%d", &array[count]);

    printf("Enter the location where you wish to delete element : \n");
    scanf("%d", &position);

    if (position >= n + 1)
        printf("Deletion not possible.\n");
    else
    {
        for (count = position - 1; count <  n - 1; count++)
        {
            array[count] = array[count + 1];
            array[count + 1] = array[count -1];
        }


        printf("Resultant array : ");

        for (count = 0; count <  n - 1; count++)
            printf("%d\n", array[count]);
    }

    return 0;
}

array[count] = array[count + 1];

array[count + 1] = array[count -1];

for (count = position - 1; count < n - 1; count++){

No change needed, program will give the correct output.

Question Number 117

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs1 = fopen("File1.txt", "r");
    fs2 = fopen("File2.txt", "r");

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    while ((ch = fgetc(fs2)) != EOF)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

ft = fopen("Final.txt", "w");

ft = fgets("Final.txt", "w");

ft = fclose("Final.txt", "w");

No change needed, program will give the correct output.

Question Number 118

#include < stdio.h>

int main()
{
    int value;
    printf("Enter the value to be checked : ");
    scanf("%d", &value);
    if ((value % 2) == 0)
        printf("%d is even", value);
    else
        printf("%d is odd ", value);
    return 0;
}

printf("Enter the value to be checked : ");

scanf("%d", &value);

if ((value % 2) == 0)

No change needed, program will give the correct output.

Question Number 119

The following program is used to check if the given number is odd or even. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>

int main()
{
    int value;
    printf("Enter the value to be checked : ");
    scanf("%d", &value);
    if ((value / 2) == 0)
        printf("%d is even", value);
    else
        printf("%d is odd ", value);
    return 0;
}

printf("Enter the value to be checked : ");

scanf("%d", &value);

if ((value / 2) == 0)

No change needed, program will give the correct output.

Question Number 120

The following program is used to sort an array of values using Bubble sort technique. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

void bubble_sort(int arry[], int n);
int main()
{
    int array[100], n, c;

    printf("Enter number of elements\n");
    scanf("%d", &n);

    printf("Enter %d integers\n", n);

    for (c = 0; c <  n; c++)
        scanf("%d", &array[c]);

    bubble_sort(array, n);

    printf("Sorted array in ascending order:\n");

    for (c = 0; c <  n; c++)
        printf("%d\n", array[c]);

    return 0;
}

void bubble_sort(int arry[], int n)
{
    int c, d, temp;

    for (c = 0; c <  (n - 1); c++)
    {
        for (d = 0; d <  n - c - 1; d++)
        {
            if (arry[d] > arry[d + 1])
            {

                temp = arry[d];
                arry[d] = arry[d - 1];
                arry[d + 1] = temp;
            }
        }
    }
}

temp = arry[d + 1];

arry[d] = arry[d -1];

arry[d + 1] = temp;

No change needed, program will give the correct output.

Question Number 121

void str_cat(char[], char[]);

int main()
{
    char str1[100], str2[100];

    printf("Input a string : \n");
    scanf("%s", str1);

    printf("Input string to concatenate : \n");
    scanf("%s", str2);

    str_cat(str1, str2);

    printf("String obtained on concatenation : %s \n", str1);

    return 0;
}

void str_cat(char str1[], char str2[])
{
    int count = 0, d = 0;
    str1[count] = '\0';

    while (str1[count] != '\0')
    {
        count++;
    }
    while (str2[d] != '\0')
    {
        str1[count] = str2[d];
        d++;
        count++;
    }


}

str1[count] = '\0';

str1[count] = str2[d]; d++;

while (str1[count] != '\0') { count++; }

No change needed, program will give the correct output.

Question Number 122

Give the output of the following code snippet :

int func(float y);
void main()
{
    int b=func(10.5);
    printf("%d",b);
}
int func(float x)
{
    float a=200.25;
    return (a);
}

200.00

200.25

200

Compilation error

Question Number 123

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs1 = fopen("File1.txt", "r");
    fs2 = fopen("File2.txt", "r");

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    ft = fopen("Final.txt", "w");

    if (ft == fs1)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    while ((ch = fgetc(fs2)) != EOF)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

if (ft == fs1)

while ((ch = fgetc(fs1)) != EOF) fputc(ch, ft);

while ((ch = fgetc(fs2)) != EOF) fputc(ch, ft);

No change needed, program will give the correct output.

Question Number 124

The following program is used to swap two values. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>
int main()
{
    int value1, value2, temp;

    printf("\nEnter the value of value1 : ");
    scanf("%d", &value1);
    printf("\nEnter the value of value2 : ");
    scanf("%d", &value2);

    printf("Before Swapping\nvalue1 = %d\nvalue2 = %d\n", value1, value2);

    temp = value1 + value2;
    value1 = value2;
    value2 = temp;

    printf("After Swapping\nvalue1 = %d\nvalue2 = %d\n", value1, value2);

    return 0;
}

temp = value1 + value2;

value1 = value2;

value2 = temp;

No change needed, program will give the correct output.

Question Number 125

The following program is used to find the GCD and LCM of two numbers. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x % y;
    b = y;

    while (b != 0)
    {
        temp = b;
        b = a % b;
        a = temp;
    }

    gcd = a;
    lcm = (x*y) / gcd;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

a = x % y;

b = y;

a = temp;

No change needed, program will give the correct output.

Question Number 126

The following program is used to copy a file. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(target)) != EOF)
        fputc(ch, source);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

while ((ch = fgetc(target)) != EOF) fputc(ch, source);

target = fopen("Destination.txt", "w");

exit(EXIT_FAILURE);

No change needed, program will give the correct output.

Question Number 127

int string_length(char[]);

int main()
{
    char str[100];
    int length;

    printf("Input a string\n");
    scanf("%s", str);
    length = string_length(str);
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length(char s[])
{
    int count = 0;

    while (s[count] != '\0')
        count++;

    return count;
}

scanf("%d", str);

length = string_length(str);

while (s[count] != '\0')

No change needed, program will give the correct output.

Question Number 128

The following program is used to add 'n' numbers. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include< stdio.h>

int main()
{
    int num, sum = 1, count, value;

    printf("Enter the number of integers to be added : \n");
    scanf("%d", &num);

    printf("Enter %d integers\n", num);

    for (count = 1; count < = num; count++)
    {
        scanf("%d", &value);
        sum = sum / value;
    }

    printf("Sum of entered integers = %d\n", sum);

    return 0;
}

sum = sum / value;

sum = 1;

sum = value;

No change needed, program will give the correct output.

Question Number 129

The following program is used to generate the fibonacci series. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?



#include < stdio.h>

int main()
{
    int count, n, num1 = 0, num2 = 1, result = 0;
    printf("Enter number of terms: ");
    scanf("%d", &n);
    printf("Fibonacci Series:\n %d  %d  ", num1, num2);
    count = 2;
    if (count< n)
    {
        result = num1 + num2;
        num1 = num2;
        num2 = result;
        ++count;
        printf("%d ", result);
    }
    return 0;
}

if (count< n)

num1 = num2;

num2 = result;

No change needed, program will give the correct output.

Question Number 130

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

stdlibrary.h

lib.h

stdlib.h

No change needed, program will give the correct output.

Question Number 131

What is the default return-type of function putchar()?

char

int

char

double

Question Number 132

Give the output of the following code snippet :

#define SWAP(a,b,c)(c=a,a=b,b=c)
void main()
{
    int a=3,b=10,c=5;
    SWAP(a,b,c);
    printf("%d %d",a,b);
}

10 3

3 10

No output

Compilation error

Question Number 133

What are the restrictions places on the names of variables and constants in C?

Should contain only letters and digits.

The first character should be a letter.

Keywords such as if, else, for etc. should not be used as variable names.

All of the above.

Question Number 134

#include < stdio.h>

int main()
{
    int value;
    printf("Enter the value to be checked : ");
    scanf("%d", &value);
    if ((value % 2) == 1)
        printf("%d is even", value);
    else
        printf("%d is odd ", value);
    return 0;
}

printf("Enter the value to be checked : ");

scanf("%d", &value);

if ((value % 2) == 1)

No change needed, program will give the correct output.

Question Number 135

The following program is used to compare two strings without using string function. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

int str_compare(char[], char[]);

int main()
{
    int flag;
    char str1[100], str2[100];

    printf("Input first string\n");
    scanf("%s", str1);

    printf("Input second string\n");
    scanf("%s", str2);

    flag = str_compare(str1, str2);

    if (flag == 0)
        printf("Entered strings are equal.\n");
    else
        printf("Entered strings are not equal.\n");

    return 0;

}

int str_compare(char a[], char b[])
{
    int count = 0;
    if (a[count] == '\0' || b[count] == '\0')
        break;

    while (a[count] == b[count])
    {
        count++;
    }

    if (a[count] == '\0' && b[count] == '\0')
        return 0;
    else
        return -1;
}

if (a[count] == '\0' || b[count] == '\0') break;

while (a[count] == b[count]) count++;

if (a[count] == '\0' && b[count] == '\0') return 0;

No change needed, program will give the correct output.

Question Number 136

Give the output of the following code snippet :

int main()
{
    int x = 2;
    x = x < <  1;
    printf("%d\n", x);
}

No output

Compilation error.

Question Number 137

string_length(char[]);

int main()
{
    char str[100];
    int length;

    printf("Input a string\n");
    scanf("%s", str);
    length = string_length(str);
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length(char s[])
{
    int count = 0;

    while (s[count] != '\0')
        count++;

    return count;
}

length = string_length(str);

while (s[count] != '\0')

string_length(char[]);

No change needed, program will give the correct output.

Question Number 138

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs1 = fopen("File1.txt", "r");
    fs2 = fopen("File2.txt", "r");

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    ft = fopen("Final.txt", "w");

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != 0)
        fputc(ch, ft);

    while ((ch = fgetc(fs2)) != EOF)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

while ((ch = fgetc(fs1)) != 0)

fputc(ch, ft);

while ((ch = fgetc(fs2)) != EOF)

No change needed, program will give the correct output.

Question Number 139

The following program is used to copy a file. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fgets("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

FILE *source, *target;

source = fgets("CopyFile.txt", "r");

if (source == NULL)

No change needed, program will give the correct output.

Question Number 140

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs1 = fopen("File1.txt", "r");
    fs2 = fopen("File2.txt", "r");

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    ft = fopen("Final.txt", "w");

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

while ((ch = fgetc(fs2)) != EOF)
fputc(ch, ft);

while ((ch = fgetc(ft)) != EOF)
fputc(ch, ft);

if ((ch = fgetc(fs2)) != EOF)
fputc(ch, ft);

No change needed, program will give the correct output.

Question Number 141

Input switching is invisible if input comes from another program using pipe mechanism in C.State true or false.

Always true.

Always false.

Sometimes true and sometimes false.

Not enough information to provide the right answer .

Question Number 142

#include < stdio.h>
#include < stdlib.h>


int main()
{
    return 0;
}

system("C:\\WINDOWS\\System32\\ipconfig ");

IPC ("C:\\WINDOWS\\System32\\ipconfig ");

System_IP("C:\\WINDOWS\\System32\\ipconfig ");

No change needed, program will give the correct output.

Question Number 143

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

FILE *source;

source = fopen("CopyFile.txt","r");

fclose(target);

No change needed, program will give the correct output.

Question Number 144

#include< stdio.h>

struct student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10],temp;
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d", &num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        printf("Enter student ID: ");
        scanf("%d", &stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }

    for (i = 0; i <  num; i++)
        for (int j = 0; j <  i; j++)
            if (stud[i].studId <  stud[j].studId)
            {
                temp[i] = stud[i];
                stud[i] = stud[j];
                stud[j] = temp[j];
            }

    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n",stud[i].studId);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

temp[i] = stud[i]; stud[i] = stud[j]; stud[j] = temp[j];

if (stud[i].studId < stud[j].studId)

for (i = 0; i < num; i++) for (int j = 0; j < i; j++)

No change needed, program will give the correct output.

Question Number 145

A string constant in C is a sequence of zero or more characters within:

" "

' '

None of the above.

Question Number 146

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

target = fopen("Destination.txt", "w");

target = fopen("Destination.txt", "r");

target = fopen("Destination.txt", "ab");

No change needed, program will give the correct output.

Question Number 147

Give the output of the following code snippet :

#define A 1 + 2
#define B 3 + 4
int main()
{
    int var = A * B;
    printf("%d\n", var);
}

Question Number 148

The following program is used to swap two strings. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

int main()
{
    char str1[100], str2[100], temp[50];

    printf("Enter the str1 string\n");
    scanf("%s", str1);

    printf("Enter the str2 string\n");
    scanf("%s", str2);

    printf("\nBefore Swapping\n");
    printf("First string: %s\n", str1);
    printf("Second string: %s\n\n", str2);

    strcpy(temp, str1);
    strcpy(str1, str2);
    strcpy(str2, str1);

    printf("After Swapping\n");
    printf("First string: %s\n", str1);
    printf("Second string: %s\n", str2);

    return 0;
}

strcpy(temp,str1);

strcpy(str1, str2);

strcpy(str2, str1);

No change needed, program will give the correct output.

Question Number 149

Give the output of the following code snippet :

#define CUBE(X) X*X*X
void main()
{
    printf("%d  ", CUBE(3));
    printf("%d", CUBE(2+3));
}

27 125

27 225

18 17

27 17

Question Number 150

The function ungetc() may be used with which of the following functions?

scanf

getc

getchar

All of the above.

Question Number 151

#include < stdlib.h>

int main()
{
    char ch;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

FILE *source, *target;

int *source, *target;

char *source, *target;

No change needed, program will give the correct output.

Question Number 152

The following program is used to generate the fibonacci series. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?



#include < stdio.h>

int main()
{
    int count, n, num1 = 0, num2 = 1, result = 0;
    printf("Enter number of terms: ");
    scanf("%d", &n);
    printf("Fibonacci Series:\n %d  %d  ", num1, num2);
    count = 2;
    while (count< n)
    {
        result = num1 + num2;
        ++count;
        printf("%d ", result);
    }
    num1 = num2;
    num2 = result;
    return 0;
}

result = num1 + num2;

num1 = num2; num2 = result;

while (count< n)

No change needed, program will give the correct output.

Question Number 153

What type of argument needs to be passed to the getc() function in C?

int

char

string

file pointer.

Question Number 154

The following program is used to add two complex numbers by passing structure to a function. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

struct complex
{
    float real;
    float imag;
};
struct complex Add(struct complex n1, struct complex n2);
int main()
{
    struct complex n1, n2, temp;
    printf("For first complex number : \n");
    printf("Enter real part :\n");
    scanf("%f", &n1.real);
    printf("Enter imaginary part :\n");
    scanf("%f", &n1.imag);
    printf("For second complex number : \n");
    printf("Enter real part :\n");
    scanf("%f", &n2.real);
    printf("Enter imaginary part :\n");
    scanf("%f", &n2.imag);
    temp = Add(n1, n2);
    printf("Sum=%.1f+%.1fi", temp.real, temp.imag);
    return 0;
}
struct complex Add(struct complex n1, struct complex n2)
{
    return(temp);
    struct complex temp;
    temp.real = n1.real + n2.real;
    temp.imag = n1.imag + n2.imag;
}

temp = Add(n1, n2);

temp.imag = n1.imag + n2.imag;

return(temp);

No change needed, program will give the correct output.

Question Number 155

The following program is used to display the student details using structures. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10];
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d",&num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        stud[i].studId = i + 1;
        printf("\nStudent ID %d\n", stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }
    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n", i + 1);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

student{

struct student stud[10];

stud[i].studId = i + 1;

No change needed, program will give the correct output.

Question Number 156

Give the output of the following code snippet :

void func(int i)
{
    void j;
    j=i;
    printf("%d",j);
}
void main()
{
    int x=10;
    func(x);
    printf("%d",x);
}

Garbage value

Compilation error

Question Number 157

void copy_str(char[], char[]);

int main()
{
    char str[100], dest[100];

    printf("Input a string\n");
    scanf("%s",str);

    copy_str(dest, str);

    printf("Source string:      %s\n", str);
    printf("Destination string: %s\n", dest);

    return 0;
}

void copy_str(char d[], char s[])
{
    int count = 0;

    while (s[count] != '\0')
    {
        d[count] = s[count];
        count++;
    }
}

d[count] = '\0';

d[count] = count;

s[count] = '\0';

No change needed, program will give the correct output.

Question Number 158

void str_cat(char[], char[]);

int main()
{
    char str1[100], str2[100];

    printf("Input a string : \n");
    scanf("%s", str1);

    printf("Input string to concatenate : \n");
    scanf("%s", str2);

    str_cat(str1, str2);

    printf("String obtained on concatenation : %s \n", str1);

    return 0;
}

void str_cat(char str1[], char str2[])
{
    int count = 0, d = 0;

    if (str1[count] != '\0')
    {
        count++;
    }
    while (str2[d] != '\0')
    {
        str1[count] = str2[d];
        d++;
        count++;
    }

    str1[count] = '\0';
}

if (str1[count] != '\0')

while (str2[d] != '\0')

str1[count] = '\0';

No change needed, program will give the correct output.

Question Number 159

The following program is used to find the GCD and LCM of two numbers. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x;
    b = y;

    while (b != 0)
    {
        temp = b;
        b = a % b;
        a = temp;
    }

    gcd = a;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

lcm = (x*y) / gcd;

lcm = (x%y) / gcd;

lcm = (x*y) / a;

No change needed, program will give the correct output.

Question Number 160

int string_length(char[]);

int main()
{
    char str[100];
    int length;

    printf("Input a string\n");
    scanf("%s", str);
    length = string_length(str);
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length()
{
    int count = 0;

    while (s[count] != '\0')
        count++;

    return count;
}

while (s[count] != '\0')

int string_length()

return count;

No change needed, program will give the correct output.

Question Number 161

void copy_str(char[], char[]);

int main()
{
    char str[100], dest[100];

    printf("Input a string\n");
    scanf("%s",str);

    copy_str(dest, str);

    printf("Source string:      %s\n", str);
    printf("Destination string: %s\n", dest);

    return 0;
}

void copy_str(char d[], char s[])
{
    int count = 0;

    while (s[count] != '\0')
    {
        d[count] = s;
        count++;
    }
    d[count] = '\0';
}

while (s[count] != '\0')

d[count] = s;

d[count] = '\0';

No change needed, program will give the correct output.

Question Number 162



#include < stdio.h>

int main()
{
    int count, n, num1 = 0, num2 = 1, result = 0;
    printf("Enter number of terms: ");
    scanf("%d", &n);
    printf("Fibonacci Series:\n %d  %d  ", num1, num2);
    while (count< n)
    {
        result = num1 + num2;
        num1 = num2;
        num2 = result;
        ++count;
        printf("%d ", result);
    }
    count = 2;
    return 0;
}

result = num1 + num2;

num1 = num2;

count = 2;

No change needed, program will give the correct output.

Question Number 163

What is the default return-type of getchar()?

char

int

char

float

Question Number 164

Give the output of the following code snippet :

void main()
{
    int k = 8;
    int m = 7;
    int z = k <  m ? k++ : m++;
    printf("%d", z);
}

Question Number 165

The following program is used to swap two strings. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

int main()
{
    char str1[100], str2[100], temp[50];

    printf("Enter the str1 string\n");
    scanf("%s", str1);

    printf("Enter the str2 string\n");
    scanf("%s", str2);

    printf("\nBefore Swapping\n");
    printf("First string: %s\n", str1);
    printf("Second string: %s\n\n", str2);

    strcpy(temp, str1);
    strcpy(str1, str2);
    strcpy(str2, temp);

    printf("After Swapping\n");
    printf("First string: %s\n", str1);
    printf("Second string: %s\n", str2);

    return 0;
}

strcpy(temp, str1);

strcpy(str1, str2);

strcpy(str2, temp);

No change needed, program will give the correct output.

Question Number 166

The following program is used to delete an element from an array. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include< stdio.h>
int main()
{
    int array[100], position, count, n;

    printf("Enter number of elements in array : \n");
    scanf("%d", &n);

    printf("Enter %d elements : \n", n);

    for (count = 0; count <  n; count++)
        scanf("%d", &array[count]);

    printf("Enter the location where you wish to delete element : \n");
    scanf("%d", &position);

    if (position >= n + 1)
        printf("Deletion not possible.\n");
    else
    {
        for (count = position - 1; count <  n - 1; count++)
            array[count] = array[count + 1];

        printf("Resultant array : ");

        for (count = 0; count <  n - 1; count++)
            printf("%d\n", array[count]);
    }

    return 0;
}

if (position == n + 1)

array[count -1] = array[count + 1];

for (count = position - 1; count < n - 1; count++)

No change needed, program will give the correct output.

Question Number 167

int str_compare(char[], char[]);

int main()
{
    int flag;
    char str1[100], str2[100];

    printf("Input first string\n");
    scanf("%s", str1);

    printf("Input second string\n");
    scanf("%s", str2);

    flag = str_compare(str1, str2);

    if (flag == 0)
        printf("Entered strings are equal.\n");
    else
        printf("Entered strings are not equal.\n");

    return 0;

}

int str_compare(char a[], char b[])
{
    int count = 0;

    {
        if (a[count] == '\0' || b[count] == '\0')
            break;
        count++;
    }

    if (a[count] == '\0' && b[count] == '\0')
        return 0;
    else
        return -1;
}

while (a[count] == b[count])

while (a[count] > b[count])

while (a[count] < b[count])

No change needed, program will give the correct output.

Question Number 168

#include < stdio.h>
int main()
{
    int value,num, reverse = 0;

    printf("Enter a number to reverse : ");
    scanf("%d", &value);

    num = value;

    while (num != 0)
    {
        reverse = reverse + 10;
        reverse = reverse + num % 10;
        num = num / 10;
    }

    if (value == reverse)
        printf(" %d is a Palindrome",value);
    else
        printf(" %d is not a Palindrome", value);

    return 0;
}

num = value;

reverse = reverse + 10;

num = num / 10;

No change needed, program will give the correct output.

Question Number 169

What is the value obtained when the sizeof operator is applied to an array?

Total number of elements in the array.

Total number of bytes taken by the array

Size of the first element of the array.

Size of the last element of the array.

Question Number 170

The following program is used to copy a file. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen(source);

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

target = fopen(source);

fclose(source);

fputc(ch, target);

No change needed, program will give the correct output.

Question Number 171

Which of the following are conditional directives in C?

#ifdef

#endif

#define

Both 1 and 2

Question Number 172

The following program is used to delete a file. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>

int main()
{
    int status;
    remove(status);
    if (status == 0)
        printf("File has been deleted successfully\n");
    else
    {
        printf("Unable to delete the file\n");
        perror("Error");
    }
    return 0;
}

int status;

remove(status);

if (status == 0)

No change needed, program will give the correct output.

Question Number 173

void MergeArrays (int[], int, int[], int, int[]);

int main()
{
    int arry1[100], arry2[100], num1, num2, c, result[200];

    printf("Input number of elements in first array\n");
    scanf("%d", &num1);

    printf("Input %d integers\n", num1);
    for (c = 0; c <  num1; c++)
    {
        scanf("%d", &arry1[c]);
    }

    printf("Input number of elements in second array\n");
    scanf("%d", &num2);

    printf("Input %d integers\n", num2);
    for (c = 0; c <  num2; c++)
    {
        scanf("%d", &arry2[c]);
    }

    MergeArrays(arry1, num1, arry2, num2, result);

    printf("Result array:\n");

    for (c = 0; c <  num1 + num2; c++)
    {
        printf("%d\n", result[c]);
    }
    return 0;
}

void MergeArrays (int arry1[], int num1, int arry2[], int num2, int result[])
{
    int i, j, k;
    j = k = 0;

    for (i = 0; i <  num1 + num2;)
    {
        if (j <  num1 && k <  num2)
        {

            if (arry1[j] == arry2[k])
            {
                result[i] = arry1[j];
                j++;
            }
            else
            {
                result[i] = arry2[k];
                k++;
            }
            i++;
        }

        else if (j == num1)
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry2[k];
                k++;
                i++;
            }
        }

        else
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry1[j];
                j++;
                i++;
            }
        }
    }
}

else if (j == num1)

if (arry1[j] == arry2[k])

if (j < num1 && k < num2)

No change needed, program will give the correct output.

Question Number 174

The following program is used to delete a file. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>

int main()
{
    int status;
    status = remove();
    if (status == 0)
        printf("File has been deleted successfully\n");
    else
    {
        printf("Unable to delete the file\n");
        perror("Error");
    }
    return 0;
}

int status;

status = remove();

if (status == 0)

No change needed, program will give the correct output.

Question Number 175

Which of the following are conditional directives in C?

#define

#elif

#pragma

All of the above

Question Number 176

Give the output of the following code snippet :

#define SQR(x)(x*x)

int main()
{
    int a, b=3;
    a = SQR(b+2);
    printf("%d\n", a);
    return 0;
}

Question Number 177

The following program is used to check the connectivity using a system command. Which of the following statement(s) given in the choices should be added to make the program compile, link and run and give the desired output?

#include < stdio.h>
#include < stdlib.h>


int main()
{
    return 0;
}

system("C:\\WINDOWS\\System32\\ping ");

ping("C:\\WINDOWS\\System32\\ping_network ");

systems("C:\\WINDOWS\\System32\\test ");

No change needed, program will give the correct output.

Question Number 178

The following program is used to swap two strings. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?

int main()
{
    char str1[100], str2[100], temp[50];

    printf("Enter the str1 string\n");
    scanf("%s", str1);

    printf("Enter the str2 string\n");
    scanf("%s", str2);

    printf("\nBefore Swapping\n");
    printf("First string: %s\n", str1);
    printf("Second string: %s\n\n", str2);
    strcpy(str1, str2);
    strcpy(temp, str1);
    strcpy(str2, temp);

    printf("After Swapping\n");
    printf("First string: %s\n", str1);
    printf("Second string: %s\n", str2);

    return 0;
}

scanf("%s", str1);

strcpy(str1, str2);

printf("Second string: %s\n", str2);

No change needed, program will give the correct output.

Question Number 179

Which of the following functions are declared in the header file math.h?

isdigit()

atan2()

cosine()

strcat()

Question Number 180

#include< stdio.h>
int main()
{
    int array[100], maximum, size, count, location = 1;

    printf("\nEnter the number of elements in array : ");
    scanf("%d", &size);

    printf("Enter %d integers : ", size);

    for (count = 0; count <  size; count++)
        scanf("\n%d", &array[count]);

    for (count = 1; count <  size; count++)
    {
        if (array[count] > maximum)
        {
            maximum = array[count];
            location = count + 1;
        }
    }

    printf("Maximum element is present at location %d and its value is %d.\n", location, maximum);
    return 0;
}

if (array[count] == maximum)

maximum = array[0];

maximum = array[count];

No change needed, program will give the correct output.

Question Number 181

#include< stdio.h>
int main()
{
    int array[100], position, count, n;

    printf("Enter number of elements in array : \n");
    scanf("%d", &n);

    printf("Enter %d elements : \n", n);

    printf("Enter the location where you wish to delete element : \n");
    scanf("%d", &position);

    if (position >= n + 1)
        printf("Deletion not possible.\n");
    else
    {
        for (count = position - 1; count <  n - 1; count++)
            array[count] = array[count + 1];

        printf("Resultant array : ");

        for (count = 0; count <  n - 1; count++)
            printf("%d\n", array[count]);
    }

    return 0;
}

for (count = 0; count < n; count++) scanf("%d", &array[count]);

for (count = 0; count = n; count++) scanf("%d", &array[count]);

for (count = 0; count > n; count++) scanf("%d", &array[count]);

No change needed, program will give the correct output.

Question Number 182

Give the output of the following code snippet :


#define square(x) x*x
int main()
{
    int x;
    x = 36/square(6);
    printf("%d", x);
    return 0;
}

No output

Question Number 183

void str_cat(char[], char[]);

int main()
{
    char str1[100], str2[100];

    printf("Input a string : \n");
    scanf("%s", str1);

    printf("Input string to concatenate : \n");
    scanf("%s", str2);

    str_cat(str1, str2);

    printf("String obtained on concatenation : %s \n", str1);

    return 0;
}

void str_cat(char str1[], char str2[])
{
    int count = 0, d = 0;

    while (str2[d] != '\0')
    {
        str1[count] = str2[d];
        d++;
        count++;
    }

    str1[count] = '\0';
}

while (str1[d] != '\0') { count++; }

while (str1[count] != '\0') { count++; }

while (str1[count] != str[d]) { count++; }

No change needed, program will give the correct output.

Question Number 184



#include < stdio.h>

int main()
{
    int count, n, num1 = 0, num2 = 1, result = 0;
    printf("Enter number of terms: ");
    scanf("%d", &n);
    printf("Fibonacci Series:\n %d  %d  ", num1, num2);
    count = 2;
    while (count< n)
    {
        result = num1 / num2;
        num1 = num2;
        num2 = result;
        ++count;
        printf("%d ", result);
    }
    return 0;
}

result = num1 / num2;

num1 = num2;

while (count< n)

No change needed, program will give the correct output.

Question Number 185

void MergeArrays (int[], int, int[], int, int[]);

int main()
{
    int arry1[100], arry2[100], num1, num2, c, result[200];

    printf("Input number of elements in first array\n");
    scanf("%d", &num1);

    printf("Input %d integers\n", num1);
    for (c = 0; c <  num1; c++)
    {
        scanf("%d", &arry1[c]);
    }

    printf("Input number of elements in second array\n");
    scanf("%d", &num2);

    printf("Input %d integers\n", num2);
    for (c = 0; c <  num2; c++)
    {
        scanf("%d", &arry2[c]);
    }

    MergeArrays(arry1, num1, arry2, num2, result);

    printf("Result array:\n");

    for (c = 0; c <  num1 + num2; c++)
    {
        printf("%d\n", result[c]);
    }
    return 0;
}

void MergeArrays (int arry1[], int num1, int arry2[], int num2, int result[])
{
    int i, j, k;
    j = k = 0;

    for (i = 0; i <  num1 + num2;)
    {
        if (j <  num1 && k <  num2)
        {

            if (arry1[j] <  arry2[k])
            {
                result[i] = arry1[j];
                j++;
            }
            else
            {
                result[i] = arry2[k];
                k++;
            }
            i++;
        }

        else if (j == num1)
        {
            {
                result[i] = arry2[k];
                k++;
                i++;
            }
        }

        else
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry1[j];
                j++;
                i++;
            }
        }
    }
}

for (; i < num1 + num2;)

for (i=0 ; i < num1 + num2;i++)

if (arry1[j] < arry2[k])

No change needed, program will give the correct output.

Question Number 186

The putchar(c) function always outputs character c to the

Screen

Standard output

Depends on the compiler

None of the above.

Question Number 187

struct Distance
{
    int feet;
    float inch;
};
struct Distance dist1, dist2, sum;

void main()
{
    printf("Enter information for 1st distance\n");
    printf("Enter feet: ");
    scanf("%d", &dist1.feet);
    printf("Enter inch: ");
    scanf("%f", &dist1.inch);
    printf("\nEnter information for 2nd distance\n");
    printf("Enter feet: ");
    scanf("%d", &dist2.feet);
    printf("Enter inch: ");
    scanf("%f", &dist2.inch);
    sum = dist1.feet + dist2.feet;
    sum.inch = dist1.inch + dist2.inch;

    if (sum.inch>12.0)
    {
        sum.inch = sum.inch - 12.0;
        ++sum.feet;
    }
    printf("\nSum of distances=%d\'-%.1f\"", sum.feet, sum.inch);
}

struct Distance dist1, dist2, sum;

sum = dist1.feet + dist2.feet;

if (sum.inch>12.0)

No change needed, program will give the correct output.

Question Number 188

Give the output of the following code snippet :

#define MAX(a, b) (a > b ? a : b)

int main()
{
    int x;
    x = MAX(3+3, 2+5);
    printf("%d\n", x);
    return 0;
}

Question Number 189

The following program is used to swap two strings. Which of the following statement(s) given in the choices should be removed to make the program compile, link and run and give the desired output?

int main()
{
    char str1[100], str2[100], temp[50];

    printf("Enter the str1 string\n");
    scanf("%s", str1);

    printf("Enter the str2 string\n");
    scanf("%s", str2);
    strcpy(str2, str1);

    printf("\nBefore Swapping\n");
    printf("First string: %s\n", str1);
    printf("Second string: %s\n\n", str2);

    strcpy(temp, str1);
    strcpy(str1, str2);
    strcpy(str2, temp);

    printf("After Swapping\n");
    printf("First string: %s\n", str1);
    printf("Second string: %s\n", str2);

    return 0;
}

strcpy(temp, str1);

strcpy(str1, str2);

strcpy(str2, str1);

No change needed, program will give the correct output.

Question Number 190

#include< stdio.h>

struct student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10],temp;
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d", &num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        printf("Enter student ID: ");
        scanf("%d", &stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }

    for (i = 0; i <  num; i++)
        for (int j = 0; j <  i; j++)
            if (stud[i].studId <  stud[j].studId)
            {
                temp = stud[i];
                stud[i] = stud[j];
                stud[j] = temp;
            }

    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n",stud[i].studId);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

struct student

for (i = 0; i < num; i++)

temp = stud[i];

No change needed, program will give the correct output.

Question Number 191

The following program is used to generate the palindrome of a number. Which of the following statement(s) given in the choices should be added to the program at some point to make the program compile, link and run and give the desired output?

#include < stdio.h>
int main()
{
    int value,num, reverse = 0;

    printf("Enter a number to reverse : ");
    scanf("%d", &value);

    num = value;

    {
        reverse = reverse * 10;
        reverse = reverse + num % 10;
        num = num / 10;
    }

    if (value == reverse)
        printf(" %d is a Palindrome",value);
    else
        printf(" %d is not a Palindrome", value);

    return 0;
}

while (num < = 0)

while (num == 0)

while (num != 0)

No change needed, program will give the correct output.

Question Number 192

#include < stdio.h>

int main()
{
    int value;
    printf("Enter the value to be checked : ");
    scanf("%d", &value);
    if ((value % 2) == -1)
        printf("%d is even", value);
    else
        printf("%d is odd ", value);
    return 0;
}

printf("Enter the value to be checked : ");

scanf("%d", &value);

if ((value % 2) == -1)

No change needed, program will give the correct output.

Question Number 193

Give the output of the following code snippet :

void fun()
{
    printf("%d\n", max * 10);
}
int main()
{
#define max 10
    fun();
    return 0;
}

100

Compilation error

Question Number 194

The scanf() function reads the input from the :

Strings

Arrays

Standard input

None of the above

Question Number 195

Which of the following data types fall under the floating types classification in C?

Float

double

Long double

All of the above

Question Number 196

A leading 0 (zero) on an integer constant is used to denote:

octal

hexadecimal

long

None of the above.

Question Number 197

#include< stdio.h>
int main()
{
    int array[100], position, count, n;

    printf("Enter number of elements in array : \n");
    scanf("%d", &n);

    printf("Enter %d elements : \n", n);

    for (count = 0; count <  n; count++)
        scanf("%d", &array[count]);

    printf("Enter the location where you wish to delete element : \n");
    scanf("%d", &position);

    if (position >= n + 1)
        printf("Deletion not possible.\n");
    else
    {

        printf("Resultant array : ");

        for (count = 0; count <  n - 1; count++)
            printf("%d\n", array[count]);
    }

    return 0;
}

for (count = position - 1; count < n - 1; count--) array[count -1] = array[count + 1];

array[count] = array[count + 1];

for (count = position - 1; count < n - 1; count++) array[count] = array[count + 1];

No change needed, program will give the correct output.

Question Number 198

Give the output of the following code snippet :

#define fun(m, n) " m ## n "
int main()
{
    printf("%s\n", fun(k, l));
}

k ## l

m ## n

Compiler error.

Question Number 199

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x;
    b = y;

    while (b != 0)
    {
        temp = b;
        b = a % b;
        a = temp;
    }

    gcd = a;
    lcm = (x*y) / gcd;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

temp = b;

gcd = a;

lcm = (x*y) / gcd;

No change needed, program will give the correct output.

Question Number 200

void MergeArrays ();

int main()
{
    int arry1[100], arry2[100], num1, num2, c, result[200];

    printf("Input number of elements in first array\n");
    scanf("%d", &num1);

    printf("Input %d integers\n", num1);
    for (c = 0; c <  num1; c++)
    {
        scanf("%d", &arry1[c]);
    }

    printf("Input number of elements in second array\n");
    scanf("%d", &num2);

    printf("Input %d integers\n", num2);
    for (c = 0; c <  num2; c++)
    {
        scanf("%d", &arry2[c]);
    }

    MergeArrays(arry1, num1, arry2, num2, result);

    printf("Result array:\n");

    for (c = 0; c <  num1 + num2; c++)
    {
        printf("%d\n", result[c]);
    }
    return 0;
}

void MergeArrays (int arry1[], int num1, int arry2[], int num2, int result[])
{
    int i, j, k;
    j = k = 0;

    for (i = 0; i <  num1 + num2;)
    {
        if (j <  num1 && k <  num2)
        {

            if (arry1[j] <  arry2[k])
            {
                result[i] = arry1[j];
                j++;
            }
            else
            {
                result[i] = arry2[k];
                k++;
            }
            i++;
        }

        else if (j == num1)
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry2[k];
                k++;
                i++;
            }
        }

        else
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry1[j];
                j++;
                i++;
            }
        }
    }
}

void MergeArrays ();

void MergeArrays (int arry1[], int num1, int arry2[], int num2, int result[])

MergeArrays(arry1, num1, arry2, num2, result);

No change needed, program will give the correct output.

Question Number 201

int string_length(char[]);

int main()
{
    char str[100];
    int length;

    printf("Input a string\n");
    scanf("%s", str);
    length = string_length();
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length(char s[])
{
    int count = 0;

    while (s[count] != '\0')
        count++;

    return count;
}

length = string_length();

count++;

while (s[count] != '\0')

No change needed, program will give the correct output.

Question Number 202

Name the escape sequence to print a tab space in printf function in C :

Question Number 203

Give the output of the following code snippet :

#define ABC 5
#define PQR "Hello World"

int main()
{
#ifdef ABC
    printf("%d",ABC * ABC);
#else
    printf("%s",PQR);
#endif

    return 0;
}

Hello World

Compiler error

Question Number 204

struct Distance
{
    int feet;
    float inch;
} dist1, dist2, sum;

void main()
{
    printf("Enter information for 1st distance\n");
    printf("Enter feet: ");
    scanf("%d", &dist1.feet);
    printf("Enter inch: ");
    scanf("%f", &dist1.inch);
    printf("\nEnter information for 2nd distance\n");
    printf("Enter feet: ");
    scanf("%d", &dist2.feet);
    printf("Enter inch: ");
    scanf("%f", &dist2.inch);
    sum.feet = dist1.feet + dist2.feet;
    sum.inch = dist1.inch + dist2.inch;

    if (sum.inch>12.0)
    {
        sum.inch = sum.inch - 12.0;
        ++sum.feet;
    }
    printf("\nSum of distances=%d\'-%.1f\"", sum.feet, sum.inch);
}

if (sum.inch>12.0)

struct Distance { int feet; float inch; } dist1, dist2, sum;

sum.inch = dist1.inch + dist2.inch

No change needed, program will give the correct output.

Question Number 205

The following program is used to copy a file. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < lib.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

#include < lib.h>

fclose(source);

target = fopen("Destination.txt", "w");

No change needed, program will give the correct output.

Question Number 206

#include < stdio.h>
int main()
{
    int value1, value2, temp;

    printf("\nEnter the value of value1 : ");
    scanf("%d", &value1);
    printf("\nEnter the value of value2 : ");
    scanf("%d", &value2);

    printf("Before Swapping\nvalue1 = %d\nvalue2 = %d\n", value1, value2);

    value2 = temp;

    printf("After Swapping\nvalue1 = %d\nvalue2 = %d\n", value1, value2);

    return 0;
}

temp = value1 + value2; value1 = value2;

temp = value1; value1 = value2;

temp = value2; value1 = value2/2;

No change needed, program will give the correct output.

Question Number 207

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x;
    b = y;

    while (b != 0)
    {
        temp = b;
        b = a / b;
        a = temp;
    }

    gcd = a;
    lcm = (x*y) / gcd;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

temp = b;

b = a / b;

a = temp;

No change needed, program will give the correct output.

Question Number 208

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x;
    b = y;

    while (b != 0)
    {
        temp = b;
        b = a % b;
        a = temp;
    }

    gcd = a % b;
    lcm = (x*y) / gcd;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

a = temp;

gcd = a % b;

lcm = (x*y) / gcd;

No change needed, program will give the correct output.

Question Number 209

Which of the following statements is true about the feof() function in C?

Tests the end of file indicator for the given stream.

Returns a non-zero value if end of file has occurred.

It is analogous to ferror() function.

All of the above.

Question Number 210

C preprocessor is conceptually the first step during compilation.

Always true

Always false

Sometimes true and sometimes false.

Not enough information to provide the accurate answer.

Question Number 211

Which of the following statements is true about the function srand()?

Sets the seed for rand.

Helps to generate a random value.

Is defined in the header file stdib.h

All of the above.

Question Number 212

int string_length(char[]);

int main()
{
    char str[100];
    int length;

    printf("Input a string\n");
    scanf("%s", str);
    length = string_length(str);
    printf("Length of string %s = %d\n", str, length);

    return 0;
}

int string_length(char s[])
{
    int count = 0;
    count++;

    while (s[count] != '\0')
        return count;
}

count++;

scanf("%s", str);

length = string_length(str);

No change needed, program will give the correct output.

Question Number 213

The #elif directive cannot be used after the conditional #else directive.

Always true

Always false

Sometimes true and sometimes false.

Not enough information to provide the accurate answer.

Question Number 214

Which of the following data types fall under the floating types classification in C?

float

char

long int

All of the above

Question Number 215

Which of the following statements are true about macros in C?

They are case sensitive.

Substitution of macros do not take place within quoted strings.

Macros have a local scope.

Both 1 and 2.

Question Number 216

Give the output of the following code snippet :

int main()
{
#ifdef Hello
    printf("Hello\t");
#else
    printf("World\t");
#endif
}

Hello

World

No output

Compilation error

Question Number 217

void copy_str(char[], char[]);

int main()
{
    char str[100], dest[100];

    printf("Input a string\n");
    scanf("%s",str);

    copy_str(dest, str);

    printf("Source string:      %s\n", str);
    printf("Destination string: %s\n", dest);

    return 0;
}

void copy_str(char d[], char s[])
{
    int count = 0;

    while (s[count] != '\0')
    {
        d[count] = s[count];
    }
    count++;
    d[count] = '\0';
}

count++;

d[count] = '\0';

copy_str(dest, str);

No change needed, program will give the correct output.

Question Number 218

Give the output of the following code snippet :

int a;
int main()
{

    printf("%d\n",a);
    return 0;
}

Garbage value

Compiler error.

Question Number 219

The following program is used to display the student details using structures. Which of the following statement(s) given in the choices should be reordered to make the program compile, link and run and give the desired output?


int main()
{
    struct student stud[10];
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d",&num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        stud[i].studId = i + 1;
        printf("\nStudent ID %d\n", stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }
    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n", i + 1);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}
struct student
{
    char name[50];
    int studId;
    int marks;
};

printf("Enter name: "); scanf("%s", stud[i].name);

printf("Enter marks: "); scanf("%d", &stud[i].marks);

struct student{ char name[50]; int studId; int marks; };

No change needed, program will give the correct output.

Question Number 220

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x;
    b = y;

    while (b != 0)
    {
        temp = b;
        a = temp;
    }

    gcd = a;
    lcm = (x*y) / gcd;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

b = a % b;

b = a / b;

b = a * b;

No change needed, program will give the correct output.

Question Number 221

While including a header file, if the file name is specified between <>, then where is the file searched?

File is searched for only in the current working directory.

File is searched for in the current directory and then the parent directories present in the path.

Either 1 or 2

None of the above.

Question Number 222

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x;
    b = y;

    while (b != 0)
    {
        temp = b;
        b = a % b;
        a = temp / b;
    }

    gcd = a;
    lcm = (x*y) / gcd;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

temp = b;

b = a % b;

a = temp / b;

No change needed, program will give the correct output.

Question Number 223

#include< stdio.h>

struct student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10],temp;
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d", &num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        printf("Enter student ID: ");
        scanf("%d", &stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }

    for (i = 0; i <  num; i++)
        for (int j = 0; j <  i; j++)
            if (stud[i].studId <  stud[j].studId)
            {
                temp = stud;
                stud[i] = stud[j];
                stud[j] = temp;
            }

    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n",stud[i].studId);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

temp = stud;

stud[i] = stud[j];

stud[j] = temp;

No change needed, program will give the correct output.

Question Number 224

#include < stdio.h>

int main()
{
    int n, count;
    int fact = 1;
    printf("Enter a value: ");
    scanf("%d", &n);
    if (n<  0)
        printf("Factorial of negative number does not exist");
    else
    {
        for (count = n; count < = 0; --count)
        {
            fact = fact * count;
        }
        printf("Factorial of %d is %d ",n,fact);
    }
    return 0;
}

int fact = 1;

for (count = n; count < = 0; --count)

if (n< 0)

No change needed, program will give the correct output.

Question Number 225

structure student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10];
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d",&num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        stud[i].studId = i + 1;
        printf("\nStudent ID %d\n", stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", &stud[i].marks);
        printf("\n");
    }
    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n", i + 1);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

structure student

struct student stud[10];

stud[i].studId = i + 1;

No change needed, program will give the correct output.

Question Number 226

#include < stdio.h>

int main()
{
    int value;
    printf("Enter the value to be checked : ");
    scanf("%d", &value);
    if ((value * 2) == 0)
        printf("%d is even", value);
    else
        printf("%d is odd ", value);
    return 0;
}

printf("Enter the value to be checked : ");

scanf("%d", &value);

if ((value * 2) == 0)

No change needed, program will give the correct output.

Question Number 227

The #if conditional directive only evaluates :

String constant

Constant integer expressions

Both 1 and 3

Question Number 228

void bubble_sort(int arry[], int n);
int main()
{
    int array[100], n, c;

    printf("Enter number of elements\n");
    scanf("%d", &n);

    printf("Enter %d integers\n", n);

    for (c = 0; c <  n; c++)
        scanf("%d", &array[c]);

    bubble_sort(array, n);

    printf("Sorted array in ascending order:\n");

    for (c = 0; c <  n; c++)
        printf("%d\n", array[c]);

    return 0;
}

void bubble_sort(int arry[], int n)
{
    int c, d, temp;

    for (c = 0; c <  (n - 1); c++)
    {
        for (d = 0; d <  n - c - 1; d++)
        {
            if (arry[d] > arry[d + 1])
            {

                arry[d-1] = arry[d];
                arry[d] = arry[d + 1];
                arry[d + 1] = temp;
            }
        }
    }
}

arry[d-1] = arry[d];

arry[d] = arry[d + 1];

arry[d + 1] = temp;

No change needed, program will give the correct output.

Question Number 229

The following program is used to copy a file. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;
    source = fopen("CopyFile.txt", "r");

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((target = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

while ((target = fgetc(source)) != EOF)

source = fopen("CopyFile.txt", "r");

fclose(source);

No change needed, program will give the correct output.

Question Number 230

The following program is used to reverse a string. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>
#include < string.h>

int main()
{
    char str[100], reverse[100];
    int strlength, count, d;

    printf("Input a string\n");
    scanf("%s",str);
    strlength = strlen(str);

    for (count = strlength - 1, d = 0; count >= 0; count--, d++)
        reverse[d] = str[strlength];

    reverse[d] = '\0';
    printf("%s\n", reverse);
    return 0;
}

reverse[d] = '\0';

for (count = strlength - 1, d = 0; count >= 0; count--, d++)

reverse[d] = str[strlength];

No change needed, program will give the correct output.

Question Number 231

Give the output of the following code snippet :

#define MSG Hello

int main()
{
    printf("MSG");
    return 0;
}

MSG

Hello

Compilation error

No output

Question Number 232

#include < stdio.h>
int main()
{
    int value,num, reverse = 0;

    printf("Enter a number to reverse : ");
    scanf("%d", &value);

    num = value;

    while (num != 0)
    {
        reverse = reverse * 10;
        reverse = reverse + num;
        num = num / 10;
    }

    if (value == reverse)
        printf(" %d is a Palindrome",value);
    else
        printf(" %d is not a Palindrome", value);

    return 0;
}

num = value;

reverse = reverse * 10;

reverse = reverse + num;

No change needed, program will give the correct output.

Question Number 233

Give the output of the following code snippet :

#define VAR 100
void func();
void main()
{
    int a=100;
#define VAR 200
    func();
    printf("%d ",VAR+a);

}
void func()
{
    printf("%d ",VAR);
}

200 200

300 300

300 200

200 300

Question Number 234

Which of the following is true about the ungetc() function in C?

Used to get a char from input.

Used to get an integer as input.

Used to push a character back to the file

None of the above.

Question Number 235

Give the output of the following code snippet :

#define MAN(x, y) ((x)>(y)) ? (x):(y);

int main()
{
    int i=10, j=5, k=0;
    k = MAN(++i, j);
    printf("%d, %d, %d\n", i, j, k);
    return 0;
}

12, 5, 0

12 ,5, 12

12 ,0, 0

No output

Question Number 236

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x;
    b = y;

    while (b != 0)
    {
        temp = b;
        b = a % b;
        a = temp;
    }

    gcd = a;
    lcm = (x*y) % gcd;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

a = temp;

gcd = a;

lcm = (x*y) % gcd;

No change needed, program will give the correct output.

Question Number 237

void MergeArrays (int[], int, int[], int, int[]);

int main()
{
    int arry1[100], arry2[100], num1, num2, c, result[200];

    printf("Input number of elements in first array\n");
    scanf("%d", &num1);

    printf("Input %d integers\n", num1);
    for (c = 0; c <  num1; c++)
    {
        scanf("%d", &arry1[c]);
    }

    printf("Input number of elements in second array\n");
    scanf("%d", &num2);

    printf("Input %d integers\n", num2);
    for (c = 0; c <  num2; c++)
    {
        scanf("%d", &arry2[c]);
    }

    MergeArrays(arry1, num1, arry2, num2, result);

    printf("Result array:\n");

    for (c = 0; c <  num1 + num2; c++)
    {
        printf("%d\n", result[c]);
    }
    return 0;
}

void MergeArrays (int arry1[], int num1, int arry2[], int num2, int result[])
{
    int i, j, k;
    j = k = 0;

    for (i = 0; i <  num1 + num2;)
    {
        if (j <  num1 && k <  num2)
        {

            if (arry1[j] <  arry2[k])
            {
                result[i] = arry1[j];
                j++;
            }
            else
            {
                result[i] = arry2[k];
                k++;
            }
            i++;
        }

        else
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry1[j];
                j++;
                i++;
            }
        }
    }
}

else if (j < num2) { for (; i < num1 + num2;) { result[i] = arry2[k]; k++; } }

else if (j > num1) { for (; i < num1 + num2;) { result[i] = arry2[k]; i++; } }

else if (j == num1) { for (; i < num1 + num2;) { result[i] = arry2[k]; k++; i++; } }

No change needed, program will give the correct output.

Question Number 238

Give the output of the following code snippet :


#define Cprog
int main()
{
    int a = 2;
#ifdef Cprog
    a = 1;
#endif
    printf("%d",a);
}

Compilation error

Question Number 239

The following program is used to reverse a string. Which of the following statement(s) given in the choices should be corrected to make the program compile, link and run and give the desired output?

#include < stdio.h>
#include < string.h>

int main()
{
    char str[100], reverse[100];
    int strlength, count, d;

    printf("Input a string\n");
    scanf("%s",str);
    strlength = strlen(str);

    for (count = strlength - 1, d = 0; count >= 0; count--, d++)
        reverse[d] = str[count];

    reverse[d] = strlen(str);
    printf("%s\n", reverse);
    return 0;
}

reverse[d] = strlen(str);

for (count = strlength - 1, d = 0; count >= 0; count--, d++)

reverse[d] = str[count];

No change needed, program will give the correct output.

Question Number 240

int main()
{
    char str[100], sub[100];
    int position, length, count = 0;

    printf("Input a string  : \n");
    scanf("%s",str);

    printf("Enter the position and length of substring\n");
    scanf("%d%d", &position, &length);

    if (count == length)
    {
        sub[count] = str[position + count - 1];
        count++;
    }
    sub[count] = '\0';

    printf("Required substring is %s\n", sub);

    return 0;
}

sub[count] = '\0';

if (count == length)

sub[count] = str[position + count - 1];

No change needed, program will give the correct output.

Question Number 241

struct student
{
    char name[50];
    int studId;
    int marks;
};

int main()
{
    struct student stud[10];
    int i, num;
    printf("Enter number of students : \n");
    scanf("%d",&num);
    printf("Enter information of students:\n");
    for (i = 0; i<  num; ++i)
    {
        stud[i].studId = i + 1;
        printf("\nStudent ID %d\n", stud[i].studId);
        printf("Enter name: ");
        scanf("%s", stud[i].name);
        printf("Enter marks: ");
        scanf("%d", stud[i].marks);
        printf("\n");
    }
    printf("Student Information :\n\n");
    for (i = 0; i<  num; ++i)
    {
        printf("\nStudent ID %d:\n", i + 1);
        printf("Name: %s", stud[i].name);
        printf("Marks: %d", stud[i].marks);
    }
    return 0;
}

scanf("%s", stud[i].name);

stud[i].studId = i + 1;

scanf("%d", stud[i].marks);

No change needed, program will give the correct output.

Question Number 242

The following program is used to print the effective username of the current user when invoked. Which of the following statement(s) given in the choices should be added to make the program compile, link and run and give the desired output?

#include < stdio.h>
#include < stdlib.h>


int main()
{
    return 0;
}

system("C:\\WINDOWS\\System32\\user");

system("C:\\WINDOWS\\System32\\user_name ");

system("C:\\WINDOWS\\System32\\whoami ");

No change needed, program will give the correct output.

Question Number 243

Give the output of the following code snippet :

void main()
{
    int b = 5 & 4 | 6;
    printf("%d", b);
}

Question Number 244

#include < stdlib.h>

int main()
{
    FILE *fs1, *fs2, *ft;
    char ch;

    fs1 = fopen("File1.txt", "r");
    fs2 = fopen("File2.txt", "r");

    if (fs1 == NULL || fs2 == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }
    while ((ch = fgetc(fs1)) != EOF)
        fputc(ch, ft);

    ft = fopen("Final.txt", "w");

    if (ft == NULL)
    {
        perror("Error ");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(fs2)) != EOF)
        fputc(ch, ft);

    printf("Two files have been merged successfully");

    fclose(fs1);
    fclose(fs2);
    fclose(ft);

    return 0;
}

fs1 = fopen("File1.txt", "r"); fs2 = fopen("File2.txt", "r");

while ((ch = fgetc(fs1)) != EOF) fputc(ch, ft);

while ((ch = fgetc(fs2)) != EOF) fputc(ch, ft);

No change needed, program will give the correct output.

Question Number 245

Consider the given statement :

printf("%-10.*d");
What does the value 10 represent?

Specifies the minimum field width.

Specifies the number of characters to be printed.

Either 1 or 2

None of the above.

Question Number 246

#include < stdio.h>

int main()
{
    int a, b, x, y, temp, gcd, lcm;

    printf("Enter two values : \n");
    scanf("%d%d", &x, &y);

    a = x;
    b = y;

    while (b != 0)
    {
        temp = b;
        b = a % b;
    }

    gcd = a;
    lcm = (x*y) / gcd;

    printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
    printf("Least common multiple of %d and %d = %d\n", x, y, lcm);

    return 0;
}

a = temp - b;

a = temp;

a + b = temp;

No change needed, program will give the correct output.

Question Number 247

Give the output of the following code snippet :

void main()
{
    int x=10;
    int i=0;
    int n2=printf("%d\n",x);
    for(i=0; i <  n2; i++)
    {
        printf("Hello");
    }
}

0
HelloHello

10
HelloHelloHello

0
HelloHelloHello

Compilation error

Question Number 248

#include< stdio.h>
int main()
{
    int array[100], maximum, size, count, location = 1;

    printf("\nEnter the number of elements in array : ");
    scanf("%d", &size);

    printf("Enter %d integers : ", size);

    maximum = array[0];

    for (count = 1; count <  size; count++)
    {
        if (array[count] > maximum)
        {
            maximum = array[count];
            location = count + 1;
        }
    }

    printf("Maximum element is present at location %d and its value is %d.\n", location, maximum);
    return 0;
}

for (count = 0; count > maximum; count++) scanf("\n%d", &array[count]);

for (count = 0; count < size; count++) scanf("\n%d", &array[count]);

for (count = 1; count > size; count++) scanf("\n%d", &array[count]);

No change needed, program will give the correct output.

Question Number 249

Give the output of the following code snippet :

#define MAX 1000
int main()
{

    printf("%d ", MAX);
    return 0;
}

No output

1000

None of the above

Question Number 250

Give the output of the following code snippet :

void main()
{
    int x=10;
    int i=0;
    int n2=printf("%d\n",x);
    for(i=0; i>n2; i++)
    {
        printf("Hello");
    }
}

0
HelloHello

10
HelloHelloHello

Question Number 251

Give the output of the following code snippet :

#define CUBE(x)((x)*(x)*(x))
void fun()
{
    int x=2;
    int y=CUBE(++x);
    printf("%d ",y);
}
void main()
{
    int a=3;
    int b;
    fun();
    b=CUBE(a+3);
    printf("%d",b);
}

64 28

27 218

125 216

81 214

Question Number 252

Which of the following if not allowed in a constant expression?

Increment/decrement operators

Function calls

Assignment statements.

All of the above.

Question Number 253

Give the output of the following code snippet :

int main()
{
    int i = 3;
    int l = i / -2;
    int k = i % -2;
    printf("%d %d\n", l, k);
    return 0;
}

-1 1

1 -1

-1 -1

Compiler error.

Question Number 254

#include < stdlib.h>

int main()
{
    char ch;
    FILE *source, *target;

    if (source == NULL)
    {
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    target = fopen("Destination.txt", "w");

    if (target == NULL)
    {
        fclose(source);
        printf("Press any key to exit...\n");
        exit(EXIT_FAILURE);
    }

    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

    printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

source = fopen("CopyFile.txt");

source = fopen(CopyFile.txt, r);

source = fopen("CopyFile.txt", "r");

No change needed, program will give the correct output.

Question Number 255

void MergeArrays (int[], int, int[], int, int[]);

int main()
{
    int arry1[100], arry2[100], num1, num2, c, result[200];

    printf("Input number of elements in first array\n");
    scanf("%d", &num1);

    printf("Input %d integers\n", num1);
    for (c = 0; c <  num1; c++)
    {
        scanf("%d", &arry1[c]);
    }

    printf("Input number of elements in second array\n");
    scanf("%d", &num2);

    printf("Input %d integers\n", num2);
    for (c = 0; c <  num2; c++)
    {
        scanf("%d", &arry2[c]);
    }

    MergeArrays(arry1, num1, arry2, num2, result);

    printf("Result array:\n");

    for (c = 0; c <  num1 + num2; c++)
    {
        printf("%d\n", result[c]);
    }
    return 0;
}

void MergeArrays (int arry1[], int num1, int arry2[], int num2, int result[])
{
    int i, j, k;
    j = k = 0;

    for (i = 0; i <  num1 + num2;)
    {
        if (j <  num1 && k <  num2)
        {

            if (arry1[j] <  arry2[k])
            {
                result[i] = arry1[j];
                j++;
            }
            i++;
        }

        else if (j == num1)
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry2[k];
                k++;
                i++;
            }
        }

        else
        {
            for (; i <  num1 + num2;)
            {
                result[i] = arry1[j];
                j++;
                i++;
            }
        }
    }
}

else { result[i] = arry2[k]; k++; }

else { result[k + 1] = arry2[k]; k++; }

else { result[i] = arry2[k]; k--; }

No change needed, program will give the correct output.