100 Multiple Choice Questions In C Programming – Part 6

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

1. In which case the return statement is not mandatory?

A When the function takes no input parameters

B When the function return void

C When the function must return 0

D None of the above

void show(void) {
  printf("Hello World\n"); 
}

2. What are the parameters of a function?

A Hints on the name of the function

B Details of the value it should return

C Variables that are sent to it and used in its processing

D None of the above

3. Which of the following statements is false?

A A function does not have to return a value

B A function can return a value of any type

C A function can return multiple values

D None of the above

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

#include <stdio.h>

int main()
{
    int x = 20000;
    double y = 26;
    int *p = &x;
    double *q = &y;
    printf("The size of p = %d and q = %d", sizeof(p), sizeof(q));
    return 0;
}

A The size of p = 4 and q = 4

B The size of p = 4 and q = 8

C erreur de compilation

D The size of p = 8 and q = 8

$gcc prog2.c
$ a.out
The size of p = 4 and q = 4

$gcc prog2.c
$ a.out
The size of p = 8 and q = 8

4. Which conversion is correct regarding the size of the data types?

A char > int > float

B int > char > float

C char < int < double

D double > char > int

5. What is a global variable?

A A variable that accessible everywhere

B A variable that can accept any type (int, float, char…)

C A variable declared in the main function

D None of the above

#include <stdio.h>
 
// global variable declaration
int x;
 
int main () {

  // local variable declaration
  int a;
 
  // initialization
  x = 1;
  a = 2;
 
  printf ("x = %d, a = %d\n", x, a);
 
  return 0;
}

x = 1, a = 2

6. What is the output of the following C program (on a 64-bit machine)?

#include <stdio.h>

union S
{
     int a;
     char b;
};

int main()
{
    union S s;
    printf("%d", sizeof(s));
    return 0;
}

A 8

B 5

C 9

D 4

$gcc prog3.c
$ a.out
4

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

#include <stdio.h>

int main()
{
    float y = 'a';
    printf("%f", y);
    return 0;
}

A a

B runtime error

C a.0000000

D 97.000000

$gcc prog4.c
$ a.out
97.000000

8. Which of these data types has a variable size?

A int

B struct

C float

D double

9. How to include a standard library?

A #include <windows.h>

B #include "windows.h"

C #include [windows.h]

D #include {windows.h}

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

#include <stdio.h>

void main()
{
     float a = 0.2;
     if (a == 0.2)
         printf("OK");
     else
         printf("KO");
}

A KO

B OK

C Runtime error

D Compilation error

if (a == 0.2f) //check if 'a' is exactly 0.2f

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