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C Preprocessor and Macros 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

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

#include<stdio.h>
50;
int main()
{
	printf("%d\n",50);
	return 0;
}

A. Runtime Error✘

B. Garbage value ✘

C. Compilation error✔

D. 50✘

x

Option: C

Explanation

Expected unqualified-id before numeric constant error will occur. Though 50; is an executable statement inside main() function, it won't outside the main() function.

✉ Answer

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

#include<stdio.h>
int main(){
	printf("%p",main);
	return 0;
}

A. Address✔

B. Compilation error✘

C. Garbage value✘

D. Runtime error✘

x

Option: A

Explanation

Some memory address will be printed.

✉ Answer

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

#include<stdio.h>
#define x 10;
int main()
{
	printf("%d",x);
	return 0;
}

A. Garbage value✘

B. Runtime error✘

C.10✘

D. Compilation error✔

x

Option: D

Explanation

Preprocessor should not terminate with semicolon.

✉ Answer

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

#include<stdio.h>
enum colors {apple,orange,mango};
int main()
{
	printf("%d %d %d",mango,apple,orange);
	return 0;
}

x

Option: B

Explanation

enum assigns numbers starting from 0, if not explicitly defined by some other integer.

✉ Answer

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

#include<stdio.h>
#define CONDITION(i) 
printf("preprocessor\n");                         
int main()
{
	CONDITION(0);
	return 0;
}

A. preprocessor✘

B. Runtime error✘

C. Compilation error✔

D. none of the above✘

x

Option: C

Explanation

#define CONDITION(i) must be terminated my backslash (\) to follow the next line.

✉ Answer

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C Preprocessor and Macros Questions and Answers