Interview Questions on Operators in C

Question: 1

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

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

(A) 11
(B) 10
(C) Compilation Error
(D) 0

Compiler
Level: Beginner Category of MCQ: operators

Question: 2

#include<stdio.h>

int main()
{
    int x;
    x=10,20,30;
    printf("%d",x);
    return 0;
}

(A) 10
(B) 20
(C) 30
(D) Compilation Error

Compiler
Level: Expert Category of MCQ: operators

Question: 3

What is sizeof() in C?

(A) Operator
(B) Function
(C) Macro
(D) None of these

Compiler
Level: Expert Category of MCQ: operators

Question: 4

Which operator has the highest precedence?

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

Compiler
Level: Beginner Category of MCQ: operators

Question: 5

#include <iostream>
using namespace std;
int main ()
{
	int x, y;
	x = 2;
	y = ++x * ++x;
	cout << x << y;
	x = 2;
	y = x++ * ++x;
	cout << x << y;
	return 0;
}

(A) 412412
(B) 41649
(C) 49416
(D) 41649

Compiler
Level: Expert Category of MCQ: operators

Question: 6

#include <iostream>
using namespace std;
main()
{
	double a = 21.09;
	float b = 10.30;
	int c ,d;
	c = (int) a;
	d = (int) b;
	cout << c <<'*'<< d;
	return 0;
}

(A) 2100
(B) 217.227
(C) 21*10
(D) 22*11

Compiler
Level: Practitioner Category of MCQ: operators

Question: 7

#include <iostream>
using namespace std;
  
int main()
{
    int i, j;
    j = 10;
    i = (j++, j++, j++);
    cout<<i;
    return 0;
}

(A) 0
(B) Compilation Error
(C) 12
(D) 10

Compiler
Level: Practitioner Category of MCQ: operators

Question: 8

How to minimize the padding issues with structure?

(A) Order members from largest to smallest
(B) Order memebers from smallest to largest
(C) By using only char data type
(D) By using referencial pointer

Compiler
Level: Expert Category of MCQ: operators

Question: 9

Find the output of below code. Is it a++ or ++b in statement a+++b.

#include <stdio.h>

int main()
{
    int a=5, b=2;
    printf("%d", a+++b);

    return 0;
}

(A) Compilation Error
(B) 8
(C) 7
(D) 0

Compiler
Level: Expert Category of MCQ: operators

Question: 10

int main()
{
  int a = 1;
  short int  b = 2;
  float c = 3;
  if(sizeof((a == 2) ? c : b) == sizeof(float))
  {
     printf("float");
  }
  else   if(sizeof((a == 2) ? c : b) == sizeof(short int))
  {
     printf("short int");
  }
return 0;                                                                                                             
}

(A) float
(B) short int
(C) nothing
(D) compilation error

Compiler
Level: Expert Category of MCQ: operators

Question: 11

#include <stdio.h>

int main()
{
int a = 0, b=1,c=2,d;

d = ++a || b++ && c++ && a++;

printf("%d %d %d %d", a,b,c,d);

return 0;
}

(A) 2 2 3 1
(B) 2 2 3 0
(C) 3 2 3 0
(D) 1 1 2 1

Compiler
Level: Expert Category of MCQ: operators

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Interview Questions on Operators in C : (11)

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