C Preprocessor Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “C-Preprocessor – 1”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. Property which allows to produce different executable for different platforms in C is called?
a) File inclusion
b) Selective inclusion
c) Conditional compilation
d) Recursive macros
View Answer

Answer: c
Explanation: Conditional compilation is the preprocessor facility to produce a different executable.

2. What is #include <stdio.h>?
a) Preprocessor directive
b) Inclusion directive
c) File inclusion directive
d) None of the mentioned
View Answer

Answer: a
Explanation: None.

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3. C preprocessors can have compiler specific features.
a) True
b) False
c) Depends on the standard
d) Depends on the platform
View Answer

Answer: a
Explanation: #pragma is compiler specific feature.

4. What will be the output of the following C code?

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```
#include <stdio.h>
```
```
#define foo(m, n) m * n = 10
```
```
int main()
```
```
{
```
```
    printf("in main\n");
```
```
}
```

a) In main
b) Compilation error as lvalue is required for the expression m*n=10
c) Preprocessor error as lvalue is required for the expression m*n=10
d) None of the mentioned
View Answer

Answer: a
Explanation: Preprocessor just replaces whatever is given compiler then checks for error at the replaced part of the code. Here it is not replaced anywhere.
Output:
$ cc pgm1.c
$ a.out
in main

5. C preprocessor is conceptually the first step during compilation.
a) True
b) False
c) Depends on the compiler
d) Depends on the standard
View Answer

Answer: a
Explanation: None.

6. Preprocessor feature that supply line numbers and filenames to compiler is called?
a) Selective inclusion
b) macro substitution
c) Concatenation
d) Line control
View Answer

Answer: d
Explanation: None.

7. #include <somefile.h> are _______ files and #include “somefile.h” ________ files.
a) Library, Library
b) Library, user-created header
c) User-created header, library
d) They can include all types of file
View Answer

Answer: d
Explanation: Both of these statement can be used to select any file.

8. What is a preprocessor?
a) That processes its input data to produce output that is used as input to another program
b) That is nothing but a loader
c) That links various source files
d) All of the mentioned
View Answer

Answer: a
Explanation: A preprocessor is a program that processes its input data to produce output that is used as input to another program.

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