C Objective Questions for Beginners

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Question: 26

Will compiler produce any compilation error if same header file is included two times?

(A) Yes
(B) No

Compiler
Level: Beginner Category of MCQ: preprocessor

Question: 27

What is the job of Assembler in C programming?

(A) It converts source code into assembly code
(B) It converts a assembly language program into machine language
(C) It convert code generated by Preprocessor to assembly code
(D) None of the above

Compiler
Level: Beginner Category of MCQ: gcc

Question: 28

#include "stdio.h"
int main()
{
int @a = 10;
printf("%d",@a);
return 0;
}

(A) 10
(B) @10
(C) 10@
(D) Compilation Error

Compiler
Level: Beginner Category of MCQ: variables

Question: 29

#include "stdio.h"
int main()
{
int __a = 10;
printf("%d",__a);
return 0;
}

(A) Compilation Error
(B) 10
(C) __10
(D) __a

Compiler
Level: Beginner Category of MCQ: variables

Question: 30

#include "stdio.h"
int a = 20;
int main()
{
int a = 10;
printf("%d", a);
return 0;
}

(A) 20
(B) Ambiguity Error
(C) 10
(D) 0

Compiler
Level: Beginner Category of MCQ: variables

Question: 31

#include "stdio.h"
int a = 20;
int main()
{
int a = 10;
printf("%d", ::a);
return 0;
}

(A) 10
(B) 20
(C) ::20
(D) ::10

Compiler
Level: Beginner Category of MCQ: variables

Question: 32

#include "stdio.h"
int main()
{
int a = 10;
printf("%d", a);
int a = 20;
printf("%d",a);
return 0;
}

(A) 1020
(B) 1010
(C) 2020
(D) Error: Redeclartion of a

Compiler
Level: Beginner Category of MCQ: variables

Question: 33

#include "stdio.h"
int main()
{
int a@ = 10;
printf("%d", a@);
return 0;
}

(A) 10
(B) 10@
(C) @
(D) [Error] stray '@' in program

Compiler
Level: Beginner Category of MCQ: variables

Question: 34

What is the extension of File produced by compiler on Windows?

(A) .a
(B) .exe
(C) .out
(D) .obj

Compiler
Level: Beginner Category of MCQ: compilation

Question: 35

Default output file produced by gcc compiler on Linux?

(A) .a
(B) a.obj
(C) a.exe
(D) a.out

Compiler
Level: Beginner Category of MCQ: compilation

Question: 36

What is the output of below program?

#include <stdio.h>
int main()
{
int a = 10;
switch(a)
{
case 10: printf("Ten"); break;
case 20: printf("Twenty");break;
case 30: printf("Thirty");break;
default: printf("nothing");
}
return 0;
}

(A) Ten
(B) Twenty
(C) Thirty
(D) Nothing

Compiler
Level: Beginner Category of MCQ: switch

Question: 37

What is the output of below program?

#include <stdio.h>
int main()
{
int a = 10;
switch(a)
{
case 10: printf("Ten"); 
case 20: printf("Twenty");break;
case 30: printf("Thirty");break;
default: printf("nothing");
}

return 0;
}

(A) Ten
(B) TenTwenty
(C) Twenty
(D) nothing

Compiler
Level: Beginner Category of MCQ: switch

Question: 38

//Program is compiled on gcc/Dev-C++ (32 bit) compiler
#include "stdio.h"
#include "string.h"

int main()
{
char arr[] = "CppBuzz.com"
printf("%d", ++arr[0]);
return 0;
}

(A) C
(B) 68
(C) D
(D) 67

Compiler
Level: Beginner Category of MCQ: loops

Question: 39

#include "stdio.h"
int main()
{
int m=10;
if(m=30,20,0)
printf ("i love u %d",m);
else 
printf ("i hate u %d",m);
return 0;
}

(A) i love u 30
(B) i hate u 0
(C) i love u 10
(D) i hate u 30

Compiler
Level: Beginner Category of MCQ: conditional

Question: 40

#include "stdio.h"

int main()
{
float a = 123/100;
printf("%f", a);
return 0;
}

(A) 1
(B) 1.0
(C) 1.0000
(D) 1.000000

Compiler
Level: Beginner Category of MCQ: datatype

Question: 41

Which operator has the highest precedence?

(A) unary
(B) shift
(C) equality
(D) postfix

Compiler
Level: Beginner Category of MCQ: operators

Question: 42

#include "stdio.h"
#include "string.h"

int main()
{
struct xyz{
    char * n;
    int eos;
};

struct xyz x = {"cppbuzz", 2017};
struct xyz y=x;
printf("%i", printf("%s",y.n));

return 0;
}

(A) cppbuzz7
(B) 7cppbuzz
(C) cppbuzz8
(D) 8cppbuzz

Compiler
Level: Beginner Category of MCQ: structure

Question: 43

Are self referential structures are possible in C?

(A) Yes
(B) No

Compiler
Level: Beginner Category of MCQ: structure

Question: 44

What will be the output of following code?
#include<stdio.h>

int main()
{
int a=4*4+2;
printf("%d",--a);
return 0;
}

(A) 17
(B) 23
(C) 24
(D) 18

Compiler
Level: Beginner Category of MCQ: loops

Question: 45

Find the output if n is 6

#include <stdio.h>

int main()
{
  int sum=0, i, j,n;
  n=6;
  
  for(i=1; i<=n; i++){      
      for(j=1; j<=n; j++){
          sum += (i+j);
      }
  }

printf("%d", sum);

return 0;
}

(A) 150
(B) 168
(C) 195
(D) 252

Compiler
Level: Beginner Category of MCQ: loops

Question: 46

#include "stdio.h"
main()
{
int a[] = {10,20,30};
printf("%d",*a+1);
}

(A) 10
(B) 20
(C) 11
(D) 21

Compiler
Level: Beginner Category of MCQ: loops

Question: 47

If the size of the array is less than the number of initializers
then

(A) Generates an error message
(B) Extra values are being ignored
(C) Size of Array is increased
(D) Size is neglected when values are given

Compiler
Level: Beginner Category of MCQ: arrays

Question: 48

Pointers can be created of following data types?

(A) character
(B) integer
(C) Unsigned character
(D) All of these

Compiler
Level: Beginner Category of MCQ: pointers

Question: 49

Point out the wrong statement about malloc

(A) Allocated memory has undefined value
(B) It returns pointer to the allocated space
(C) Pointer is NULL if memory is not allcoated
(D) It doesn't lead to memory leak if memory is not de allocated

Compiler
Level: Beginner Category of MCQ: malloc_free

Question: 50

int **ptr;

(A) ptr is not a pointer
(B) ptr is a pointer to pointer
(C) Such statement no allowed in C
(D) None of these

Compiler
Level: Beginner Category of MCQ: pointers

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