Pointers - C Questions

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Data Types - C Questions

Data Types Questions - 1 Data Types Questions - 2 Data Types Questions - 3 Data Types Questions - 4 Data Types Questions - 5

Operators - C Questions

Operators Questions - 1 Operators Questions - 2 Operators Questions - 3 Operators Questions - 4 Operators Questions - 5

Structures - C Questions

Structures Questions - 1 Structures Questions - 2 Structures Questions - 3 Structures Questions - 4 Structures Questions - 5

Files - C Questions

Files Questions - 1 Files Questions - 2 Files Questions - 3 Files Questions - 4 Files Questions - 5

printf - C Questions

printf Questions - 1 printf Questions - 2 printf Questions - 3 printf Questions - 4 printf Questions - 5

Variables - C Questions

Variables Questions - 1 Variables Questions - 2 Variables Questions - 3 Variables Questions - 4 Variables Questions - 5

Preprocessor Macros

Preprocessor Macros - 1 Preprocessor Macros - 2 Preprocessor Macros - 3 Preprocessor Macros - 4 Preprocessor Macros - 5

While Loop - C Questions

While Loop Questions - 1 While Loop Questions - 2 While Loop Questions - 3 While Loop Questions - 4 While Loop Questions - 5

for Loop - C Questions

for Loop Questions - 1 for Loop Questions - 2 for Loop Questions - 3 for Loop Questions - 4 for Loop Questions - 5

if else - C Questions

if else Questions - 1 if else Questions - 2 if else Questions - 3 if else Questions - 4 if else Questions - 5

Switch case - C Questions

Switch case Questions - 1 Switch case Questions - 2 Switch case Questions - 3 Switch case Questions - 4 Switch case Questions - 5

Array - C Questions

Array Questions - 1 Array Questions - 2 Array Questions - 3 Array Questions - 4 Array Questions - 5

Functions - C Questions

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Memory Allocation

Memory Allocation - 1 Memory Allocation - 2
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C Preprocessor and Macros 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 Preprocessor and Macros 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 Preprocessor and Macros to make your MNC interview very easy.

C Preprocessor and Macros Questions

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

#include<stdio.h>                      
#define x 1+2
int main()
{
	int i;
	i = x * x * x;
	printf("%d",i);
}

A. 27

B. 13

C. 7

D. None of the one

x

 

Option: C

Explanation

i = x * x * x;

i = 1+2 * x * x;

i = 3 * x * x;

i = 3 * 1+2 * x;

i = 3 + 2 * x;

i = 5 * x;

i = 5 * 1 + 2;

i = 5 + 2;

i = 7;

Thus C compiler outputs i = 7

Answer


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

#include<stdio.h>
#define a =
int main()
{
	int num a 6;
	printf("%d",num);
	return 0;
}

A. 6

B. Compilation error

C. Garbage value

D. Runtime error

x

 

Option: A

Explanation

= is defined in proprocessor with the name of a. Thus no problem with a normal compilation flow..

Answer


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

#include<stdio.h>
#define fun(x,y) x*y
int main()
{
	int x = 2, y = 1;
	printf("%d",fun(x + 2, y - 1));
	return 0;
}

A. 4

B. 2

C. 0

D. 3

x

 

Option: D

Explanation

In printf we called the function fun(x + 2, y - 1);.

Now printf looks like this fun(2 + 2, 1 - 1). and control goes to #define preprocessor directive.

fun(2 + 2, 1 - 1) 2 + 2 * 1 - 1

fun(2 + 2, 1 - 1) 2 + 2 - 1

fun(2 + 2, 1 - 1) 4 - 1

fun(2 + 2, 1 - 1) 3

Thus it returns 3 to the printf and outputted.

Answer


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

#include<stdio.h>
int main()
{
	char DATE[15] = "Current Date";
	printf("%s\n", __DATE__ );
	return 0;
}

A. Current Date

B. Mar-24-2017

C. Mar-2017-24

D. 2017-24-Mar

x

 

Option: B

Explanation

__DATE__ is a C macro which print the current date as a character literal in "MMM DD YYYY" format.

Answer


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

#include<stdio.h>
int main()
{
	char TIME[15] = "Current Time";
	printf("%s\n",__TIME__);
	return 0;
}

A. MM:HH:SS

B. SS:MM:HH

C. HH:MM:SS

D. Current Time

x

 

Option: C

Explanation

The current time as a character literal in "HH:MM:SS" format

Answer


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