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C if else 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 if else 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 if else to make your MNC interview very easy.

C if else Questions

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

#include<stdio.h>
int main()
{
	char str[8] = "if block";
	if(str == "if block")
		printf("if block executed");
	else
		printf("else block executed");
	return 0;
}

A. if block executed✘

B. else block executed✔

C. Compilation Error✘

D. None of the above✘

x

Option: B

Explanation

✉ Answer

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

#include<stdio.h>
int main()
{
	char str[] = "\0";
	if(printf("%s",str))
		printf("inside if block");
	else
		printf("inside else block");
	return 0;
}

A. inside else block✔

B. inside if block✘

C. Compilation Error✘

D. ✘

x

Option: A

Explanation

In the above C program, the printf statement or expression inside if block prints nothing. So the expression returns 0 and else block gets executed.

✉ Answer

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

#include<stdio.h>
int main()
{
	if(printf("0"))
		printf("inside if block");
	else
		printf("inside else block");
	return 0;
}

A. inside if block✘

B. inside else block✘

C. 0inside else block✘

D. 0inside if block✔

x

Option: D

Explanation

The printf statement inside if block prints 0, so the expression returns 1. Finally the if block gets executed.

✉ Answer

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

#include<stdio.h>
#define NULL 0
int main()
{
	if(printf("0") == NULL)
		printf("inside if block");
	else
		printf("inside else block");
	return 0;
}

A. 0inside if block✘

B. 0inside else block✔

C. 0inside else block✘

D. inside if block✘

x

Option: B

Explanation

The if statement compares two expressions and returns a result. We can consider the if(printf("0") == NULL) as if(expression1 == expression2). The expression1(printf("0") prints 0) returns 1 and expression2 is 0. So the condition is false and else block will be executed.

✉ Answer

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

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

x

Option: C

Explanation

The if(!printf("")) is in a format if(!expression). The expression(printf("") returns 0 because it prints nothing) and the condition becomes true because of ! operator. So the if block gets executed.

✉ Answer

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C if else Questions and Answers