Interview Questions on loops in C - for, while & do-while

Question: 1

How many loops are there in C

(A) 2
(B) 3
(C) 4
(D) 1

Compiler
Level: Beginner Category of MCQ: loops

Question: 2

//What is the output of the below program?
#include<stdio.h>
int main()
{
for(; ;)
for(; ;)
    printf("Hello..");

return 0;
}

(A) Compilation Error
(B) Runtime Error
(C) Hello is printed one time
(D) Hello is printed infinite times

Compiler
Level: Expert Category of MCQ: loops

Question: 3

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

int main()
{
 for(; ;);
 for(; ;);
    printf("Hello");
return 0;
}

(A) Compilation Error
(B) Runtime Error
(C) Nothing is printed
(D) Hello is printed infinite times

Compiler
Level: Expert Category of MCQ: loops

Question: 4

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

int main()
{
 int i;

 for(i = 0,i<5,i++)
 {
   printf("Hello");
 }

 return 0;
}

(A) Hello is printed 5 times
(B) Compilation Error
(C) Runtime Error
(D) Hello is printed 4 times

Compiler
Level: Expert Category of MCQ: loops

Question: 5

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

int main()
{
 int i;
 for(i=0; i<5; ++i++)
 {
   printf("Hello");
 }
 return 0;
}

(A) Hello is printed 5 times
(B) Compilation Error
(C) Hello is printed 2 times
(D) Hello is printed 3 times

Compiler
Level: Expert Category of MCQ: loops

Question: 6

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

int main()
{
 int i,j;
 for(i = 0,j=0;i<5;i++)
 {
   printf("%d%d--",i,j);
 }
 return 0;
}

(A) 0--01--12--23--34--
(B) 00--10--20--30--40--
(C) Compilation Error
(D) 00--01--02--03--04--

Compiler
Level: Expert Category of MCQ: loops

Question: 7

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

int main()
{
int i,j,k,count;
count=0;
for(i=0;i<5;i++)
{
   for(j=0;j<5;j++)
   {
      count++;
   }
}
printf("%d",count);
return 0;
}

(A) 5
(B) 10
(C) 25
(D) 50

Compiler
Level: Practitioner Category of MCQ: loops

Question: 8

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

int main()
{
  int i;
  for(i=0; i<5; i++);
  {
    printf("cppbuzz");
  }

  return 0;
}

(A) cppbuzz is printed 5 times
(B) Compilation Error
(C) cppbuzz is printed 1 times
(D) Nothing is printed

Compiler
Level: Practitioner Category of MCQ: loops

Question: 9

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

int main()
{
int i,j,count;
count=0;
for(i=0; i<5; i++);
{ 
	for(j=0;j<5;j++);
	{
	    count++;
	}
}
printf("%d",count);
return 0;
}

(A) 55
(B) 54
(C) 1
(D) 0

Compiler
Level: Practitioner Category of MCQ: loops

Question: 10

//How many times CppBuzz.com is printed?
#include<stdio.h>

int main()
{
while(1)
{
    printf("CppBuzz.com");
}

return 0;
}

(A) 1 time
(B) Compilation Error
(C) Infinite times
(D) Runtime Error

Compiler
Level: Practitioner Category of MCQ: loops

Question: 11

//How many times CppBuzz.com is printed?
#include<stdio.h>

int main()
{
while(1);
{
    printf("CppBuzz.com");
}

return 0;
}

(A) 1 time
(B) 0 time
(C) Compilation/Runtime Error
(D) Blank Screen in Infinite Loop

Compiler
Level: Practitioner Category of MCQ: loops

Question: 12

//What is printed on console?
#include<stdio.h>

int main()
{
int a = 0;
while(a)
{
    printf("CppBuzz.com");
}

return 0;
}

(A) CppBuzz.com is printed Infinite times
(B) CppBuzz.com is printed 1 time only
(C) Nothing is printed
(D) Program gives error

Compiler
Level: Practitioner Category of MCQ: loops

Question: 13

//How many times CppBuzz.com is printed on console?
#include<stdio.h>

int main()
{
int a = 0;
while(a==0)
{
    printf("CppBuzz.com");
}

return 0;
}

(A) 0 times
(B) Infinite times (Untill Stack is overflow)
(C) 1 time
(D) Nothing is printed

Compiler
Level: Expert Category of MCQ: loops

Question: 14

//How many times CppBuzz.com is printed on console?
#include<stdio.h>

int main()
{
int a = 0;
while(a++)
{
    printf("CppBuzz.com");
}

return 0;
}

(A) Nothing is printed on screen
(B) 0 time
(C) 1 time
(D) Infinite times (Untill Stack overflow)

Compiler
Level: Practitioner Category of MCQ: loops

Question: 15

//How many times CppBuzz.com is printed?
#include<stdio.h>

int main()
{
int a = 0;
while(a++);
{
    printf("CppBuzz.com");
}

return 0;
}

(A) 0 time
(B) 1 time
(C) Compilation Error
(D) Infinite times

Compiler
Level: Practitioner Category of MCQ: loops

Question: 16

//How may times CppBuzz.com is printed?
#include<stdio.h>

int main()
{
int a = 0;
while(++a++);
{
    printf("CppBuzz.com");
}

return 0;
}

(A) 1 time
(B) 0 time
(C) Infinite Times(Until Stack overflows)
(D) Error: Lvalue Required

Compiler
Level: Beginner Category of MCQ: loops

Question: 17

//How many times CppBuzz.com is printed?
#include<stdio.h>

int main()
{
int a = 0;
while(++a)
{
    printf("CppBuzz.com");
}

return 0;
}

(A) 1 time
(B) It depends on the size of int
(C) Infinite Times(Until Stack overflows)
(D) Error

Compiler
Level: Beginner Category of MCQ: loops

Question: 18

How many times CppBuzz.com is printed?
int main()
{
int a = 0;
while(a)
printf("CppBuzz.com");

return 0;
}

(A) 1 time
(B) Compilation Error
(C) 0 time
(D) Infinite Times(Until Stack Overflows)

Compiler
Level: Beginner Category of MCQ: loops

Question: 19

//How many times CppBuzz.com is printed?
#include<stdio.h>

int main()
{
int a = 0;
while(a++)
printf("CppBuzz.com");

return 0;
}

(A) 1 time
(B) 0 time
(C) Infinite times(Until Stack is overflow)
(D) 2 times

Compiler
Level: Beginner Category of MCQ: loops

Question: 20

//How many times CppBuzz.com is printed?
#include<stdio.h>

int main()
{
int a = 0;
while(a++ < 5)
printf("CppBuzz.com");
return 0;
}

(A) 4 times
(B) 5 times
(C) 0 time
(D) Infinite times

Compiler
Level: Practitioner Category of MCQ: loops

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Interview Questions on Loops in C : (20)

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