Knowledge check.

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

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 2

Give the output of the following code snippet :

void main()
{

    int x = 5 % 2 * 4 / 2;
    printf("%d", x);
}

No output

Question Number 3

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\\ipaddress ");

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

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

No change needed, program will give the correct output.

Question Number 4

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 added to the program at some point 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("\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);
}

printf("Enter inch: "); scanf("%f", &dist1.inch);

printf("Enter inch: "); scanf("%f", &dist1);

printf("Enter inch: "); scanf("%f", &dist1->inch);

No change needed, program will give the correct output.

Question Number 5

Which of the following statements is true about EOF in C?

It is a string constant.

It is defined in the header file < string.h>

The value of EOF is typically -1

All of the above.

Question Number 6

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 (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;
}

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

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

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

No change needed, program will give the correct output.

Question Number 7

Which preprocessor operator allows to concatenate actual arguments during macro expansion?

Question Number 8

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;

    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 9

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 10

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

copy_str(dest, str);

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

s[count] = '\0';

No change needed, program will give the correct output.

Question Number 11

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 added to the program at some point 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++)
    {
        if (arry[d] > arry[d + 1])
        {

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

for (c = 10; c < (n * 1); c--)

for (d = 0; d < n - c - 1; d++)

if (arry[d] > arry[d + 1])

No change needed, program will give the correct output.

Question Number 12

Give the output of the following code snippet :

void func(int a)
{
    a=200;
    printf("%d",a);
}
void main()
{
    func(10);
}

200

No output

Compilation error

Question Number 13

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();
    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 14

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,"r");

    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,"r");

fclose(source);

fputc(ch, target);

No change needed, program will give the correct output.

Question Number 15

Consider the given statement for the function ungetc(). Which of the following is true?

int ungetc(int c, FILE *fp)

Returns either c or EOF for an error.

Returns 0 if error occurs.

Returns file pointer.

None of the above.

Question Number 16

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;
    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 17

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 = -1;
    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 = -1;

scanf("%d", &n);

fact = fact * count;

No change needed, program will give the correct output.

Question Number 18

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 19

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

short

long

unsigned

All of the above.

Question Number 20

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;
            }
        }
    }
}

for (c = 0; c < (n - 1); c++)

for (d = 0; d > n ; d++)

if (arry[d] == arry[d + 1])

No change needed, program will give the correct output.

Question Number 21

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 22

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);

    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);
    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 23

The following program is used to reverse a string. 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>
#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] = '\0';
    printf("%s\n", reverse);
    return 0;
}

scanf("%s",str);

strlength = strlen();

reverse[d] = str[count];

No change needed, program will give the correct output.

Question Number 24

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 25

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

All of the above

Question Number 26

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

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

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

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

No change needed, program will give the correct output.

Question Number 27

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 28

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

    return 0;
}

if (value == num)

reverse = reverse + num % 10;

num = num / 10;

No change needed, program will give the correct output.

Question Number 29

The following program is used to delete an element from 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], position, count, n;

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

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

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

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

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

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

No change needed, program will give the correct output.

Question Number 30

What is a FILE in C?

One of the basic datatypes in c.

Pointer to the structure defined in stdio.h

It is a structure declaration in stdio.h

None of the above.

Question Number 31

Give the output of the following code snippet :

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

No output

Compiler error

Question Number 32

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);
}

8 32

6 24

8 216

Compilation error

Question Number 33

Which is true about function tolower in C ?

The function tolower is defined in string.h

Returns the ASCII value of the lower case character.

Converts an upper case letter to lower case.

All of the above.

Question Number 34

Give the output of the following code snippet :

#define INFLOOP while(1)

int main()
{
    INFLOOP
    printf("Hello");
    return 0;
}

Hello

No output

Compiler error

Infinite loop

Question Number 35

#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);

    reverse[d] = str[count];

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

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

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

for (count = 1, d = 0; count != 0; count++, d++)

No change needed, program will give the correct output.

Question Number 36

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);

    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(str1, str2);

void str_cat();

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

No change needed, program will give the correct output.

Question Number 37

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;

    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 = fopen("Final.txt");

ft = fopen(fs1,fs2);

No change needed, program will give the correct output.

Question Number 38

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);

    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 39

Give the output of the following code snippet :


{
    int a = 5, b = -7, c = 0, d;
    d = ++a && ++b || ++c;
    printf("%d  %d  %d  %d  ", a,b, c, d);
}

6 6 0 1

6 -5 0 1

6 -6 0 1

6 5 1 1

Question Number 40

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

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

reverse[d] = str[count];

reverse[d] = '\0';

No change needed, program will give the correct output.

Question Number 41

Which of the following are conditional directives in C?

#define

#elif

#pragma

All of the above

Question Number 42

Give the output of the following code snippet :

int main()
{
    const int a = 10;

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

Compiler error

Question Number 43

Give the output of the following code snippet :

extern int a;
void func(int a)
{
    a=200;
    printf("%d",a);
}
void main()
{
    func(10);
    printf("%d",a);
}

200

Compilation error

Question Number 44

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 + 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);
}

sum.feet = dist1.feet + dist2.feet;

sum.inch = dist1.inch + dist2.inch;

sum.inch = sum.inch - 12.0;

No change needed, program will give the correct output.

Question Number 45

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

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

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

No change needed, program will give the correct output.

Question Number 46

The following program is used to add 'n' 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 num, sum = 0, 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);
    }

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

    return 0;
}

sum = sum + value;

sum = sum * value;

sum = sum / value;

No change needed, program will give the correct output.

Question Number 47

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 48

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);
    }

    fputc(ch, target);

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

    fclose(source);
    fclose(target);

    return 0;
}

while ((ch = fgetc(source)) == 0)

while ((ch = fgetc(source)) != 1)

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

No change needed, program will give the correct output.

Question Number 49

How many characters of pushback are guaranteed per file when ungetc() is used.

Two

One

Cannot be determined.

Zero

Question Number 50

The following program is used to generate the fibonacci series. 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 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 = num1 / 2;
        num2 = result;
        ++count;
        printf("%d ", result);
    }
    return 0;
}

num1 = num2;

num2 = num1 / 2;

num2 = result

No change needed, program will give the correct output.

Question Number 51

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

char

int

char

float

Question Number 52


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(char[], char[]);

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

void copy_str(char[]);

No change needed, program will give the correct output.

Question Number 53

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 be added to the program at some point 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[position + count - 1];
        count++;
    }
    sub[count] = '\0';

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

    return 0;
}

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

count++;

sub[count] = '\0';

No change needed, program will give the correct output.

Question Number 54

Which of the following are types of C constants ?

Integer constants

Real or floating point constants.

Octal / Hexadecimal constants

All of the above.

Question Number 55

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

d[count] = '\0';

copy_str(dest, str);

d[count] = s[count];

No change needed, program will give the correct output.

Question Number 56

Which of the following statements is true about the function rand()?

Sets the seed for srand() function.

Helps to generate square root of a value.

Is defined in the header file stdlib.h

All of the above.

Question Number 57

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)
        {
            {
                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 58

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++;
    }
    while (str1[count] == str2[count])
    {
        str1[count] = str2[d];
        d++;
        count++;
    }

    str1[count] = '\0';
}

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

while (str1[count] == str2[count])

str1[count] = '\0';

No change needed, program will give the correct output.

Question Number 59

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)
{
    struct complex temp;
    temp= n1.real + n2.real;
    temp.imag = n1.imag + n2.imag;
    return(temp);
}

struct complex temp;

temp= n1.real + n2.real;

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

No change needed, program will give the correct output.

Question Number 60

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;
}

str_compare(char[], char[]);

flag = str_compare(str1, str2);

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

No change needed, program will give the correct output.

Question Number 61

Which of the following are types of C constants ?

Integer constants

String constants.

Octal / Hexadecimal constants

All of the above.

Question Number 62

The following program is used to generate the fibonacci series. 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>

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;
        printf("%d ", result);
    }
    return 0;
}

num2 = result; --count;

num1 = result; ++count;

num2 = result; ++count;

No change needed, program will give the correct output.

Question Number 63

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 64

#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);

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

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

strlength = strlen(str);

strlength = strlength(str);

strlength = stringlength(str);

No change needed, program will give the correct output.

Question Number 65

Which of the following operators is used to obtain the complement of an integer value?

None of the above.

Question Number 66

The following program is used to generate the palindrome of a number. 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 value,num, reverse = 0;

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

    num = value;
    reverse = reverse * 10;
    reverse = reverse + num % 10;

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

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

    return 0;
}

reverse = reverse * 10; reverse = reverse + num % 10;

if (value == reverse) printf(" %d is a Palindrome",value);

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

No change needed, program will give the correct output.

Question Number 67

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 68

Give the output of the following code snippet :

#define FUNC(x)  while(i!=0) \
				{\
				  i--;\
				  x--;\
				  printf("%d ",x);\
				  }

int main()
{
    int z=10,i=2;
    FUNC(z);
}

10 10

10 9

9 8

9 9

Question Number 69

Give the output of the following code snippet :

int main()
{
    int x = 0, y = 2;
    if (!x && y)
        printf("True\n");
    else
        printf("False\n");
}

True

False

Compiler error

No output

Question Number 70

Which of the following statements is not true about the scanf() function in C?

It reads the characters from the standard input.

Stops execution when some input fails to match control specification

It does not return any value.

All of the above.

Question Number 71

Give the output of the following code snippet :

#define VAR 100;
int main()
{
#if var
    printf("True");
#else
    printf("False");
#endif
    return 0;
}

True

False

No output

Compilation error

Question Number 72

What is the difference between the printf() and the fprintf() functions?

fprintf() takes the file pointer as the first argument.

fprintf() takes the file name as the first argument.

fprintf() does not return any value.

All of the above.

Question Number 73

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 74

The macro va_start initializes the argument pointer to point to ?

First unnamed argument

First named argument.

Second named argument.

List of unnamed arguments

Question Number 75

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[0];
        count++;
    }
    d[count] = '\0';
}

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

d[count] = '\0';

d[count] = s[0];

No change needed, program will give the correct output.

Question Number 76

#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];
                temp = 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[j];

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

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

No change needed, program will give the correct output.

Question Number 77

The unary + operator has greater priority than the binary + operator. State true or false :

Always true

Always false

Sometimes true and sometimes false.

No enough information to provide a valid answer.

Question Number 78

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>

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++)
        {
            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 (stud[i].studId < stud[j].studId)

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

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

No change needed, program will give the correct output.

Question Number 79

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 80

Give the output of the following code snippet :

void main()
{
    int long;
    long=10;
    printf("%d",long);
}

Garbage value

Compilation error

Question Number 81

#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);

    while ((ch = fgetc(fs2)) != EOF)
        fclose( ft);

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

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

    return 0;
}

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

fclose(fs1); fclose(fs2);

while ((ch = fgetc(fs2)) != EOF) fclose( ft);

No change needed, program will give the correct output.

Question Number 82

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, str2);
    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, str2);

strcpy(str1, str2);

strcpy(str2, temp);

No change needed, program will give the correct output.

Question Number 83

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 84

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("Input.txt");
    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("Input.txt");

if (status != 0)

No change needed, program will give the correct output.

Question Number 85

Which of the following statements is true about the qualifier constant?

It is a keyword.

The value of any variable specified with this keyword cannot be changed.

When used in array arguments in a function, the function does not modify that array.

All of the above.

Question Number 86

What is the use of getchar()?

The next input character each time it is called.

EOF when it encounters end of file.

Both 1 and 2

None of the above

Question Number 87

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 88

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);

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

    return 0;
}

strcpy(str1, temp);

strcpy(str2, temp);

strcpy(str2);

No change needed, program will give the correct output.

Question Number 89

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);
    }

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

    target = fopen("Destination.txt", "w");
    while ((ch = fgetc(source)) != EOF)
        fputc(ch, target);

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

    fclose(source);
    fclose(target);

    return 0;
}

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

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

fputc(ch, target);

No change needed, program will give the correct output.

Question Number 90

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;
    int *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;
}

char ch;

int *source, *target;

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

No change needed, program will give the correct output.

Question Number 91

Give the output of the following code snippet :

int main()
{
    int y = 1, x = 0;
    int l = (y++, x++) ? y : x;
    printf("%d\n", l);
}

No output

Question Number 92

int string_length(char[]);

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

    printf("Input a string\n");
    scanf("%s", str[100]);
    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')

scanf("%s", str[100]);

No change needed, program will give the correct output.

Question Number 93

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);
    temp = Add(n1, n2);
    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.real,temp.imag);

return(temp);

return(real,imag);

No change needed, program will give the correct output.

Question Number 94

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

FILE* status;

status = remove("Input.txt");

if (status == 0)

No change needed, program will give the correct output.

Question Number 95

Give the output of the following code snippet :

#define CUBE(x)(x*x*x)
#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);
}

8 12

6 18

8 24

Compilation error

Question Number 96

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 97

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 98

Give the output of the following code snippet :

#define FUNC(x,y,z) x##y##z
void main()
{
    int val=100;
    int val12=200;
    int val123=300;
    printf("%d",FUNC(val1,2,3));
}

100

200

300

Compilation error

Question Number 99

#include< stdio.h>

int main()
{
    int num, sum = 0, 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++)
    {
        sum = sum + value;
    }

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

    return 0;
}

scanf("%d", &value);

scanf("%d", value);

scanf("%d", sum);

No change needed, program will give the correct output.

Question Number 100

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 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);

    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;
}

scanf("%d", &array);

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

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

No change needed, program will give the correct output.

Question Number 101

Which of the following is the general declaration of the minprintf() function?

int minprintf(char *fmt,....)

void minprintf(char *fmt,....)

void minprintf(char *fmt,char *fm2)

char minprintf(char *fmt,char *fm2);

Question Number 102

#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 103

#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;

    if (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;

if (b != 0)

b = a % b;

No change needed, program will give the correct output.

Question Number 104

Give the output of the following code snippet :

void main()
{
    func(10);
}
void func(int a)
{
    a=200;
    printf("%d",a);
}

200

Compilation error

Question Number 105

#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 106

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("Input.txt");
    while (status == -1)
        printf("File has been deleted successfully\n");
    else
    {
        printf("Unable to delete the file\n");
        perror("Error");
    }
    return 0;
}

int status;

status = remove("Input.txt");

while (status == -1)

No change needed, program will give the correct output.

Question Number 107

#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"); fs2 = fopen("File2.txt");

fs1 = fopen(fs2, "r"); fs2 = fopen(fs1, "r");

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

No change needed, program will give the correct output.

Question Number 108

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 109

Give the output of the following code snippet :

int main(int argc, char **argv)
{
    char s[10] = "Hello";
    int i = 4;
    printf("%10.*s", i, s);
}

Hello

Hell

Hello [Note : 5 spaces to the left of Hello]

Hell [Note : 6 spaces to the left of Hell]

Question Number 110

Give the output of the following code snippet :

void main()
{
    int k = sqrt(-4);
    printf("%d\n", k);
}

NAN

Compiler error

Question Number 111

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 112

What are the two arguments taken by the putc() function in C?

Address of value, file pointer

Character to be written to file, file pointer.

Array of characters, address of array.

None of the above.

Question Number 113

Give the output of the following code snippet :

#define a 10
#define a 68
int main()
{
    printf("%c ",a);

    return 0;
}

Compiler error.

Question Number 114

Give the output of the following code snippet :

#define MIN(x,y) (x< =y?x:y);

void main()
{
    int a=9,b=10,d;
    d=MIN(a++,--b);
    printf("%d",d);
}

Compilation error

Question Number 115

#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 116

Give the output of the following code snippet :

void main()
{
#define const float
    const val = 100.25;
    printf("%.2f", val);
}

0.00

100.25

Garbage value

Compilation error

Question Number 117

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()
{
    int count = 0;

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

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

d[count] = s[count];

void copy_str()

No change needed, program will give the correct output.

Question Number 118

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] = str2[d];
    d++;
    str1[count] = '\0';
}

str1[count] = '\0';

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

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

No change needed, program will give the correct output.

Question Number 119

Give the output of the following code snippet :

#define MAX(x,y) (x)>(y)?(x):(y)

int main()
{

    int i=10,j=9,k=0;

    k=MAX(i++,++j);

    printf("%d %d %d",i,j,k);

    return 0;
}

10 10 10

10 11 11

11 10 11

11 11 11

Question Number 120

#include< stdio.h>

structure 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;
}

structure student

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

temp = stud[i];

No change needed, program will give the correct output.

Question Number 121

#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;

while (b == 0)

b = a % b;

No change needed, program will give the correct output.

Question Number 122

#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 123

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 124

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';
}

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

d[count] = '\0';

count--;

No change needed, program will give the correct output.

Question Number 125

Give the output of the following code snippet :


#define A B + 2
#define B C + 4
#define C A + 5
int main()
{
    int var = A * B - C;
    printf("%d\n", var);
}

Compilation error

Question Number 126

#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 + num % 10;
        num = num / 10;
    }

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

    return 0;
}

reverse = reverse * 10;

reverse = reverse + num % 10;

reverse = reverse / 10;

No change needed, program will give the correct output.

Question Number 127

The associativity of the left and right shift operators, << and >> is from :

Left to right.

Right to left

Either 1 or 2

None of the above.

Question Number 128

Give the output of the following code snippet :

int main()
{
    int x = 2, y = 0;
    int z = y && (y != 10);
    printf("%d\n", z);
    return 0;
}

No output

Question Number 129

#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 130

The following program is used to reverse a string. 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>
#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);
    reverse[d] = '\0';

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

    printf("%s\n", reverse);
    return 0;
}

scanf("%s",str);

strlength = strlen(str);

reverse[d] = '\0';

No change needed, program will give the correct output.

Question Number 131

Give the output of the following code snippet :


void main()
{
    int k = fabs(-87);
    printf("%d\n", k);
}

-87

None of the above.

Question Number 132

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 133

#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 > 0; 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 < position; count++)

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

for (count = position - 1; count > 0; count--)

No change needed, program will give the correct output.

Question Number 134

What is the escape sequence in C to add a backspace?

Question Number 135

Give the output of the following code snippet :

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

Compiler error

Question Number 136

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 rearranged 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])
            {
                arry[d] = arry[d + 1];
                temp = arry[d];
                arry[d + 1] = temp;
            }
        }
    }
}

arry[d] = arry[d + 1];

for (d = 0; d < n - c - 1; d++)

if (arry[d] > arry[d + 1])

No change needed, program will give the correct output.

Question Number 137

cos(x) returns

sine of x where x is in radians

sine of x where x is in degree

cosine of x where x is in radians

cosine of x where x is in degree

Question Number 138

void 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;
}

void string_length(char[]);

length = string_length(str);

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

No change needed, program will give the correct output.

Question Number 139

#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 140


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;
}

int string_length(char[]);

void string_length(char[]);

int string_length();

No change needed, program will give the correct output.

Question Number 141

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;

    {
        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;
}

while (b != 0)

if (b != 0)

while (b == 0)

No change needed, program will give the correct output.

Question Number 142

Give the output of the following code snippet :

extern void func();
extern int a;
int a=20;
void main()
{
    func();
    printf("%d",a);
}
void func()
{
    a=200;
    printf("%d ",a);
}

200 200

20 200

20 20

Compilation error

Question Number 143

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 144

Give the output of the following code snippet:

void main()
{
    int c;
    scanf ("%d",c);
    printf("Obtained value is %d", c);
}

Garbage value

Run time error

None of the above

Question Number 145

Which of the following are conditional directives in C?

#ifdef

#endif

#ifndef

All of the above

Question Number 146

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 147

Name the library function used in C to display the output on the console to the user :

scanf ()

main()

printf()

None of the above .

Question Number 148

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);

for (i = 2; i < = value % 2; ++i)

if (flag == 0)

No change needed, program will give the correct output.

Question Number 149

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 150

#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 151

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 152

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 153

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];

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

if (array[count] > maximum)

maximum = array[count];

No change needed, program will give the correct output.

Question Number 154

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);
    }

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

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

    while ((ch = fgetc(source)) != EOF)
        printf("File copied successfully.\n");

    fclose(source);
    fclose(target);

    return 0;
}

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

if (target == NULL)

fputc(ch, target);

No change needed, program will give the correct output.

Question Number 155

The “else if” in conditional inclusion is written as?

#else if

#elseif

#elsif

#elif

Question Number 156

Give the use of the .(period) in the prinft() format control string :

To display a .(period) between two values.

To concatenate two values.

To separate the field width from the precision of the floating point values.

None of the above.

Question Number 157

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)
{
    struct complex temp;
    temp.real = n1.real + n2.real;
    temp.imag = n1.imag + n2.imag;
    return(temp.real,temp.imag);
}

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

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

return(temp.real,temp.imag);

No change needed, program will give the correct output.

Question Number 158

#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)
    {
        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 = a+b;

temp = b;

a = b;

No change needed, program will give the correct output.

Question Number 159

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 <  num1;)
    {
        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 < num1 + num2;)

for (; i < num1;)

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

No change needed, program will give the correct output.

Question Number 160

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++;
        count++;
    }

    str1[count] = '\0';
}

str1[count] = str2;

str1[count] = '\0';

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

No change needed, program will give the correct output.

Question Number 161

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 ");

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

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

No change needed, program will give the correct output.

Question Number 162

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;

    {
        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 163

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 /2 ); 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;
            }
        }
    }
}

for (d = 0; d < n - c - 1; d++)

for (c = 0; c < (n /2 ); c++)

if (arry[d] > arry[d + 1])

No change needed, program will give the correct output.

Question Number 164

Give the use of the -(minus) sign in the prinft() format control string :

Left-justify the output within the specified field.

Include a negative sign to the value.

To convert positive to negative values

None of the above.

Question Number 165

Every source file that makes a reference to an input/output function must contain :

stdio.h

stdinpout.h

math.h

stdinop.h

Question Number 166

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 167

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 168

Give the output of the following code snippet :

void func(int a);
void main()
{
    func(10);
    printf("%d",a);
}

No output

Compilation error

Question Number 169

#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;
}

reverse = reverse * 10;

reverse = reverse + num % 10;

num = num / 10;

No change needed, program will give the correct output.

Question Number 170

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 171

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 172

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


int main()
{
    return 0;
}

ping("C:\\WINDOWS\\System32\\ping ");

Check_network("C:\\WINDOWS\\System32\\ping ");

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

No change needed, program will give the correct output.

Question Number 173

#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);
    }

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

    fclose(source);
    fclose(target);

    return 0;
}

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

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

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

No change needed, program will give the correct output.

Question Number 174

Give the output of the following code snippet :

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

10 3

3 10

No output

Compilation error

Question Number 175

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

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

    copy_str(dest, str);
    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';
}

d[count] = s[count];

copy_str(dest, str);

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

No change needed, program will give the correct output.

Question Number 176

If there is any error while opening a file, fopen will return

Nothing

EOF

NULL

Question Number 177

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 178

Of the two logical operators && and ||, which one has greater precedence?

Both have equal precedence.

None of the above.

Question Number 179

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 = 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 180

Which of the following operators in C has the lowest precedence?

Question Number 181

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

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

    return 0;
}

while (count < length)

while (count == length)

while (count != length)

No change needed, program will give the correct output.

Question Number 182

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

    str1[count] = '\0';
}

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

while (str2[count] == '\0')

str1[count] = '\0';

No change needed, program will give the correct output.

Question Number 183

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

scanf

getc

getchar

All of the above.

Question Number 184

Which of the following is an example for the format specification %.2f in the scanf() function?

23.2345

123.34

34.456

All of the above.

Question Number 185

Give the output of the following C code snippet :

void main()
{
    printf(" Make hay \n");
    printf("While the sun shines");
}

Make hay While the sun shines

Make hay
While the sun shines

Either 1 or 2

None of the above.

Question Number 186

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 187

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 188

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;)
    {
        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;)

for (; i < num1 + num2;)

else if (j == num1)

No change needed, program will give the correct output.

Question Number 189

Give the output of the following code snippet :

#define CUBE(x) (x*x*x)

int main()
{
    int a, b=3;
    a = CUBE(b++);
    printf("%d, %d\n", a, b);
    return 0;
}

9 , 4

25, 4

25,6

Compiler error

Question Number 190

An unsigned constant in C is written with the terminal :

Either 1 or 2

None of the above.

Question Number 191

Which standard header contains a set of definitions that define how to step through an argument list in C?

stdio.h

stdlib.h

math.h

stdarg.h

Question Number 192

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 < stringlength.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] = '\0';
    printf("%s\n", reverse);
    return 0;
}

#include < stdio.h>

#include < stringlength.h>

strlength = strlen(str);

No change needed, program will give the correct output.

Question Number 193

#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)
        {
            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 194

Which among the following is not a logical or relational operator?

Question Number 195

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 196

The C pre-processors are specified with which symbol?

" "

None of the above

Question Number 197

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

    str1[count] = '\0';
}

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

while (str1[count] == str2[count])

str1[count] = '\0';

No change needed, program will give the correct output.

Question Number 198

The following program is used to find the factorial 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 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 = 1; count < = n; ++count)
        {
            fact = fact * count;
        }
        printf("Factorial of %d is %d ",n,fact);
    }
    return 0;
}

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

int fact = 1;

fact = fact * count

No change needed, program will give the correct output.

Question Number 199

The following program is used to delete 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 < stdio.h>

int main()
{
    int status;
    status = remove("Input.txt");

    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("Input.txt");

if (status == 0)

No change needed, program will give the correct output.

Question Number 200

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;
}

length = string_length(str);

int string_length(char[]);

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

No change needed, program will give the correct output.

Question Number 201

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] = '\0';

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

    return 0;
}

{ sub[count] = str[position]; count++; }

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

{ sub[count] = str[position + count - 1] }

No change needed, program will give the correct output.

Question Number 202

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;
}

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

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

    return count;
}

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

void string_length(char s[])

return count;

No change needed, program will give the correct output.

Question Number 203

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 204

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;

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

    return count;
}

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

length = string_length(str);

scanf("%s", str);

No change needed, program will give the correct output.

Question Number 205

Which among the following is odd one out?

printf

fprintf

putchar

scanf

Question Number 206

#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 207

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 208

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 209

What are the uses of libraries in C?

Contains the definitions for the functions that are declared in the header files.

Library functions can be used to implement a lot of repetitive and complicated code.

Both 1 and 2

None of the above.

Question Number 210

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 211

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)
        {

            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)

result[i] = arry1[j];

if (j < num1)

No change needed, program will give the correct output.

Question Number 212

#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);
    }

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

    fclose(source);
    fclose(target);

    return 0;
}

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

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

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

No change needed, program will give the correct output.

Question Number 213

#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);

    value1 = value2;
    value2 = temp;

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

    return 0;
}

temp = value1;

temp = value1 + value2;

temp = value2;

No change needed, program will give the correct output.

Question Number 214

Which of the following cannot be used with ungetc?

scanf

getc

getchar

printf

Question Number 215

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;

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

    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;
}

b = a % b;

gcd = a;

lcm = (x*y) / gcd;

No change needed, program will give the correct output.

Question Number 216

The following program is used to display the student details using 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?


{
    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;
}

struct student

structure student

struct

No change needed, program will give the correct output.

Question Number 217

int string_length(char[]);

int main()
{
    char str;
    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;
}

char str;

length = string_length(str);

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

No change needed, program will give the correct output.

Question Number 218

Give the output of the following code snippet :

void main()
{
    int a = 2 + 3 - 4 + 8 -  5 % 4;
    printf("%d\n", a);
}

Question Number 219

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(str2, temp);

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

    return 0;
}

strcpy(str1, str2);

strcpy(str1);

strcpy(str2, str1);

No change needed, program will give the correct output.

Question Number 220

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 221

Which of the following statements is true about EOF in C?

It is a symbolic constant.

It is defined in the header file stdio.h

The value of EOF is typically 1.

Both 1 and 2

Question Number 222

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

Tests the error indicator for the given stream.

Returns zero if end of file has occurred.

It is analogous to ferror() function.

All of the above.

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)
            {

                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[i];

temp = stud[j];

temp = stud;

No change needed, program will give the correct output.

Question Number 224

Give the output of the following code snippet :

# define max

void main()
{
    max;

}

No output

Compiler error

Question Number 225

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) AND ((x +y LT z) ==0))
        printf("%d",x+y+z);
    else
        printf("%d",z-y-x);
}

600

Compilation error

No output

Question Number 226

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 227

Give the output of the following code snippet :

extern int x=10;
void main()
{
    int x=30;
    {
        x+=10;
        printf("%d ",x);
    }
    printf("%d",x);
}

30 30

40 40

30 40

40 30

Question Number 228

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 229

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);
    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);

strcpy(str1, str2);

strcpy(str2, temp);

No change needed, program will give the correct output.

Question Number 230

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;
}

struct student

scanf("%s", stud[i].name);

printf("Name: %s", stud[i].name);

No change needed, program will give the correct output.

Question Number 231

How is the header file included in the C program?

#include "file.h"

#include < file.h>

Either 1 or 2

None of the above.

Question Number 232

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 233

#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;
        }
    }

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

if (array[count] == maximum)

maximum = array[size];

maximum = array[count];

No change needed, program will give the correct output.

Question Number 234



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

string.h

stringlen.h

stringlength.h

No change needed, program will give the correct output.

Question Number 235

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];
    char temp;

    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;
}

char temp;

strcpy(temp, str1);

strcpy(str1, str2);

No change needed, program will give the correct output.

Question Number 236

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 237

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

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

    return 0;
}

strcpy(temp, str1);

scanf("%s", str1);

No change needed, program will give the correct output.

Question Number 238

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 239

#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)
    {
        b = a % b;
        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;
}

gcd = a;

b = a % b;

lcm = (x*y) / gcd;

No change needed, program will give the correct output.

Question Number 240

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++;
    }

    str1[count] = '\0';
}

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

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

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

No change needed, program will give the correct output.

Question Number 241

Which of the following are format specifiers in C?

Both 1 and 2

Question Number 242

Which of the following statements is true with regards to #ifdef directive?

Used to check whether an identifier has been defined or not.

Used to check the value of the identifier.

Both 1 and 2

None of the above.

Question Number 243

Give the output of the following code snippet :

#define MIN 10
#ifdef MIN
#define MAX 20
#endif
int main()
{
    printf("%d %d\n", MAX, MIN);
    return 0;
}

20 10

0 10

0 0

Compilation error

Question Number 244

#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;
}

reverse = reverse * 10;

reverse = reverse + num % 10;

num = num / 10;

No change needed, program will give the correct output.

Question Number 245

Give the output of the following code snippet :

int main()
{
#if VAR
    printf("%d",VAR);
#else
    printf("Hello World");
#endif
}

Hello world

No output

Compilation error

Question Number 246

Give the output of the following code snippet :

void main()
{

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

}

Hello World

Hello World 10

Hello World 12

Compilation error

Question Number 247

#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 248

#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 == 0)
    {
        perror("Error ");
        break;
    }

    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;
}

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

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

if (ft == 0) { perror("Error "); break; }

No change needed, program will give the correct output.

Question Number 249

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

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

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

No change needed, program will give the correct output.

Question Number 250

#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 251

#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 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;
}

printf("Enter student ID: "); scanf("%d", &stud.studId);

printf("Enter student ID: "); scanf("%d", stud[i].studId);

printf("Enter student ID: "); scanf("%d", &stud[i].studId);

No change needed, program will give the correct output.

Question Number 252

#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 253

Give the output of the following code snippet :

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

1.73

Compilation error

Question Number 254

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, num2, 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);
    }
    return 0;
}

count = 0; num1 = 0; num2 = 0;

count = 2; num1 = 0; num2 = 0;

count = 2; num1 = 0; num2 = 1;

No change needed, program will give the correct output.

Question Number 255

#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.