100 Multiple Choice Questions In C Programming – Part 11

This collection of 100 Multiple Choice Questions and Answers (MCQs) In C Programming : Quizzes & Practice Tests with Answer focuses on “C Programming”.
 

1. We want to change the size of an array ‘Arr’ of integers, from 10 to 11 integers ?

A Arr = (int *) malloc(11* sizeof(int));

B Arr = (int *) malloc(11);

C Arr= (int *) realloc(T, 11* sizeof(int));

D Arr = (char *) realloc(11 * sizeof (int));

2. P points to an array of 10 integers, we want to free the memory it occupies. So how do we do it?

A P = NULL;

B *P = 0;

C free(P);

D free(*P);

3. What is the value of “z” in this code?

#include <stdio.h>

int main()
{
    int x = 10;
    double y = 5.6;
    int c;
    int z = x + y;
    printf("Value of z is %d", z);
}

A Value of z is 10

B Value of z is 15

C Value of z is 15.6

D Value of z is 16

4. What is the value of “z” in this code?

#include <stdio.h>

int main()
{
    int x = 10, y = 5, w = 5;
    int d;
    int z = x == (y + w);
    printf("Value of z is %d", z);
}

A Value of z is 5

B Value of z is 1

C Value of z is 10

D Syntax error

5. What is the output of the following C program?

#include <stdio.h>

int main()
{
     int a = 1, b = 0, c = 3;
     a > b ? printf("%d", c) : return c;
}

A 1

B 3

C Runtime error

D Compilation error

error: expected expression before 'return'
a > b ? printf("%d", c) : return c;
                          ^

#include <stdio.h>
 
int main()
{
    int a = 1, b = 0, c = 3;
    if(a > b )
        printf("%d", c); 
    else
        return c;
}

6. What is the output of the following C program?

#include <stdio.h>

void main()
{
    int a = 1, c = 3;
    int b = a << 3;
    printf(" %d\n", b);
}

A 8

B 1

C -724794438

D Compilation error

7. What is the output of the following C program?

#include <stdio.h>

void main()
{
    int a = 0, b = 2, c = 3;
    int x = a & b | c;
    printf("%d", x);
}

A 2

B 3

C 0

D Depends on compiler

  00000000 
& 00000010
  __________
= 00000000 = 0 (in decimal)

  00000000
| 00000011
  __________
= 00000011 = 3 (in decimal)

8. What is the output of the following C program?

#include <stdio.h>

int main()
{
     int a = 0, b = 0;
     if (a && (b = a + 10))
         //do something
         ;
         ;
}

A 10

B 0

C Depends on compiler

D Depends on the standard

B

The most recent C compiler (currently C99 with some modifications) returns 0 by default, if there is no explicit return instruction at the end of the function.
 

 

9. What is the output of the following C program?

#include <stdio.h>

int main()
{
     int a = 1;
     if (a++ && (a == 1))
         printf("OK\n");
     else
         printf("KO\n");
}

A KO

B OK

C Depends on compiler

D Depends on the standard

10. Why is it called C++?

A Because it is the increment of the C language

B Because it is the C language plus the Javascript language

C Because it’s more elegant

D All the answers are true

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