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C While Loop Questions

In most of the MNC interview questions such as in ZOHO interview question, IVTL Infoview interview questions, Amazon interview questions, GOOGLE interview questions, Infosys interview questions and even in Voonik interview questions, We come across several Tricky C Questions about which 2:5 of the questions are from While Loop in c. Solving that kind of tricky C questions is not an easy task for all C programmers. We need more practices to solve it with ease. So we provide 25+ interesting C questions in While Loop to make your MNC interview very easy.

C While Loop Questions

1. What will be the output of the C program?

#include<stdio.h>
int x = -1;
int main(){
	while(x++ == 1)
		printf("loop");
	return 0;
}

A. Prints Nothing

B. loop

C. loop loop

D. loop loop loop

x

 

Option: A

Explanation

The condition of this loop says that if x++ == 1 then executes the statement, otherwise don't. The condition is false so the control exit from the loop and program ends.

Answer


2. What will be the output of the C program?

#include<stdio.h>
int main(){
	int i = 5;
	while(--i > 0)
		printf("Loop ");
	return 0;
}

A. Loop Loop Loop Loop Loop Loop

B. Loop Loop Loop Loop Loop

C. Loop Loop Loop Loop

D. Loop Loop Loop

x

 

Option: C

Explanation

We have declared and intialize the variable i = 5, the condition is (--i > 0). Here i is pre-decremented one by one until 1. It will be 4, 3, 2 and 1 for each iteration.

Answer


3. What will be the output of the C program?

#include<stdio.h>
int main(){
	while(printf("%d", 5) < 4)
		printf("Loop ");
	return 0;
}

A. Prints Nothing

B. 5Loop 5Loop 5Loop 5Loop 5Loop

C. 5Loop

D. Infinite iterations or Infinite Loop

x

 

Option: D

Explanation

We don't have any control in the above C program because there is no variables. If there is any variable we can control it. The condition is (printf("%d", 5) < 4) it will be (1 < 4), the condition is always true. So the loops is infinite. The same program using some variable.

#include<stdio.h>
int main(){
	int i = 0; 
	while(printf("%d", 5) < 4)
	{ 	
		printf("Loop ");
	if(i == 4)
		break;
	else
		i++;
	}
	return 0;
}

Answer


4. What will be the output of the C program?

#include<stdio.h>
int main()
{
	int i = 0;
	while(i < 4, 5)
	{
		printf("Loop ");
		i++;
	}
	return 0;
}

A. Infinite Loop

B. Loop Loop Loop Loop Loop

C. Loop Loop Loop Loop

D. Prints Nothing

x

 

Option: A

Explanation

The above while loop have a condition while(i < 4, 5) it is in the format of while(expression1, expression2), here it is seperated by a comma(,) operator, so the expression1 is evaluated first then expression2 is evaluted, though expression1 is failed, expression2 will execute until the expression2 becomes false.

Answer


5. What will be the output of the C program?

#include<stdio.h>
int main()
{
	int i;
	while(0, i < 4)
	{
		printf("Loop ");
		i++;
	}
	return 0;
}

A. Prints Nothing

B. Infinit Loop

C. Loop Loop Loop Loop

D. Loop Loop Loop Loop Loop

x

 

Option: C

Explanation

The condition (0, i < 4) is in the format (expression1, expression2), here expression1(0) goes false, though expression2 will get executed until expression2 is false.

Answer


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