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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C if else 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 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

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

#include<stdio.h>
int x = 0;
int main(){
	if(x == x)
		printf("hai this is if");
	else
		printf("hai this is else");
	return 0;
}

A. hai this is if

B. hai this is else

C. prints nothing

D. Compile Time Error

x

 

Option: A

Explanation

This program will print the statement inside the if block because if statement just compare two values(0 == 0, condition is true) and returns 1(true). So the statement inside if block is executed.

Answer


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

#include<stdio.h>
#define FALSE -1
#define NULL 0
#define TRUE 1

int main(){
	if(NULL)
		printf("NULL");
	else if(FALSE)
		printf("TRUE");
	else
		printf("FALSE");
	return 0;
}

A. FALSE

B. NULL

C. TRUE

D. Compilation Error

x

 

Option: C

Explanation

The if block will be executed if the condition returns a non-zero value. In the above program, if(NULL) is appears like if(0), here the condition is false. Then else if(FALSE) is appears like else if(-1), here it has a non-zero value so the else if block is executed.

Answer


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

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

A. 0 0

B. 0 1

C. 1 0

D. 1 1

x

 

Option: D

Explanation

In the above program, the if(i++ == j++) is appears like if(0 == 0), condition is true. So the if block gets executed.

Answer


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

#include<stdio.h>
int main(){
	int i = 0, j = 1, k = 0;
		if(++k, j, i++)
			printf("%d %d %d", i, j, k);
	return 0;
}

A. Prints Nothing

B. 1 1 0

C. 0 1 0

D. Compilation Error

x

 

Option: A

Explanation

In the above program, the if(++k, j, i++) will appears like if(1, 1, 0) consider this as (expression1, expression2, expression3), in this context, first expression1 is evaluated, expression2 is evaluated, then expression3 is evaluated, and the value of expression3 is returned for the whole expression. As a result the condition is false. So it will prints nothing.

Answer


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

#include<stdio.h>
int main(){
	int i;
		if(true)
			printf("This will work");
		else 
			printf("This will not work");
	return 0;
}

A. This will work

B. This will not work

C. Compilation Error

D. Runtime Error

x

 

Option: C

Explanation

Error: Undefined symbol 'true'.
The above C program will prints error message because C programming does not support the keyword 'true' and 'false'.

Answer


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