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C While Loop Interview Questions and Answers

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

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

#include<stdio.h>
int main()
{
	int i = 0;
	while(;;) 
	{
		printf("Hai Loop");
		if (i == 2)
		break;
		i++;
	}
	return 0;
}

A. Hai Loop

B. Compilation Error

C. Hai Loop Hai Loop

D. Hai Loop Hai Loop Hai Loop

x

 

Option: B

Explanation

Compilation Error: Expression Syntax Error

Answer


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

#include<stdio.h>
int main()
{
	while(!!7)
		printf("Hai");
	return 0;
}

A. Hai Hai Hai Hai Hai Hai Hai

B. Hai

C. Infinite Loop

D. Prints Nothing

x

 

Option: C

Explanation

The condition (!!7) becomes (1). So the while loop condition is always True and loop executed infinitely.

Answer


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

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

A. Compilation Error

B. HiDoWhile

C. HiDoWhile HiDoWhile HiDoWhile

D. HiDoWhile HiDoWhile

x

 

Option: D

Explanation

The do while loop atleast execute the block once even the condition is false. In the above C program, when it comes first time the loop automatically executes without checking condition and second time it executes because i(post increment) returns -1 and execute it again. In the next iteration the variable i = 0. condition is false.

Answer


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

#include<stdio.h>
int main(){
	while(!printf("Steve is awesome"));
	return 0;
}

A. Steve is awesome

B. Infinite Loop

C. Prints Nothing

D. None of the Above

x

 

Option: A

Explanation

The while(!printf("Steve is awesome")) will print the string and exit from the loop. i.e) while(!1)

Answer


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

#include<stdio.h>
int main()
{
	int i[3] = {1, 4, 0};
	while(i[2] == i[3])
	{
		if(i[3])
	    printf("Loop ");
		else
		break;
	}
	return 0;
}

A. Compilation Error

B. Runtime Error

C. Prints Nothing

D. Loop

x

 

Option: C

Explanation

The array variable i is allocated to store three integer values.
Note: array index starts from 0. i.e) 0, 1, 2 for the above program. But here we use index i[3] which has default value 0 so condition is true. Then the control flows into while block and if condition will be if(0). Finally else block gets executed.

Answer


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