C Objective Questions for Beginners

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Question: 51

//If system architecture is 64 bits
#include "stdio.h"

int main(){

int *ptr = NULL;

printf("%d",sizeof(ptr));

return 0;
}

(A) 2
(B) 4
(C) 8
(D) 0

Compiler
Level: Beginner Category of MCQ: pointers

Question: 52

What is the output of the program?
#include <stdio.h>

int main()
{
for(i=3;i<15;i++);
printf("%d",i); return 0; }

(A) 3
(B) 15
(C) 16
(D) Compilation error

Compiler
Level: Beginner Category of MCQ: loops

Question: 53

In C programming it is not mandatory to typecast pointer return by malloc() function

(A) True
(B) False

Compiler
Level: Beginner Category of MCQ: malloc_free

Question: 54

//Assume that this code is running on 64 bit system

#include <stdio.h>

enum Xenum{
    C, CPP, Java
};

int main()
{
enum Xenum var;
printf("%d",sizeof(var));
return 0;

}

(A) 1
(B) 3
(C) 4
(D) 12

Compiler
Level: Beginner Category of MCQ: enum

Question: 55

Can we have enum containing enum with same contestant?

#include "stdio.h"

enum Yenum{
       C, CPP, Java
};

enum Xenum{
    C, CPP, Java, Yenum
};

int main()
{
  enum Xenum var;
  printf("%d",sizeof(var));
  return 0;
}

(A) Enum can contain enum but duplicate contestants are not allowed
(B) Enum can't contain enum
(C) Enum can contain enum but not accessible
(D) This code will produce compilation error

Compiler
Level: Beginner Category of MCQ: enum

Question: 56

/* Find the output of below C program */

#include "stdio.h"

typedef enum{
    Male, Female
}SEX;

int main()
{
  SEX var = Male;
  printf("%d",var);
  return 0;

}

(A) Male
(B) 0
(C) 1
(D) Compilation Error

Compiler
Level: Beginner Category of MCQ: enum

Question: 57

/* Assume you are on 32 bit system */

#include <stdio.h>

union example{
    char ch;
    int no;
};

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

(A) 3
(B) 4
(C) 5
(D) 6

Compiler
Level: Beginner Category of MCQ: union

Question: 58

union example{

};

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

(A) 0
(B) 1
(C) 2
(D) 4

Compiler
Level: Beginner Category of MCQ: loops

Question: 59

/* find the output of below code on Union in C */
#include "stdio.h"

union example{
    int a;
    int b;

};

int main(){
union example obj;
obj.a = 10;
printf("%d %d", obj.a, obj.b);
return 0;
}

(A) 10 0
(B) 10 GarbageValue
(C) 10 10
(D) 0 0

Compiler
Level: Beginner Category of MCQ: union

Question: 60

#include "stdio.h"

union example{
    int a;
    int b;

};

int main(){
    union example obj;
    obj.a = 88;
    printf("%d", obj.a);
    obj.b = 99;
    printf("%d", obj.b);
    return 0;
}

(A) 88 88
(B) 99 88
(C) 99 99
(D) 88 99

Compiler
Level: Beginner Category of MCQ: union

Question: 61

What is the use of rewind() function in C?

(A) set the position to the beginning point
(B) gives current position in the file
(C) set the position to desire point
(D) None of these

Compiler
Level: Beginner Category of MCQ: filehandling

Question: 62

what is the output of the following code
#include "stdio.h"
int main()
{
    while(!printf("hello")){}
	return 0;
}

(A) compilation error
(B) hello
(C) no output
(D) runtime error

Compiler
Level: Beginner Category of MCQ: loops

Question: 63

What will be the output of following program ?
#include <stdio.h>
void main()
{
char cnt=0;
for(;cnt++;printf("%d",cnt)) ;
printf("%d",cnt);
}

(A) 0 1 2 3 ... infinite times
(B) 0 1 2 ... 127
(C) 0
(D) 1

Compiler
Level: Beginner Category of MCQ: loops

Question: 64

#include < stdio.h >
int main()
{
    int tally=0;
    for(;;)
    {
        if(tally==10)
            break;
        printf("%d ",++tally);
    }
    return 0;
}

(A) 0 1 2 3 4 5 6 7 8 9 10
(B) 0 1 2 3 ... infinite times
(C) 1 2 3 4 5 6 7 8 9 10
(D) 1 2 3 4 5 6 7 8 9

Compiler
Level: Beginner Category of MCQ: loops

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