C Preprocessor MCQs

Question 1

What is the result of the #error directive in C preprocessing?

Accepted Answer

Generates a compilation error with a specified error message

Answer

Defines a macro

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Checks for syntax errors

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Excludes code

Question 2

What is the purpose of the #pragma message directive in C preprocessing?

Accepted Answer

Includes a message in the code

Answer

Defines a macro

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Checks for syntax errors

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Excludes code

Question 3

In C, how do you use the #ifndef directive to conditionally include code if a macro is not defined?

Accepted Answer

#ifndef MACRO

Answer

#ifndef(MACRO)

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#ifndef:MACRO

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#ifndef: MACRO

Question 4

What does the #pragma once directive do in C preprocessing?

Accepted Answer

Prevents multiple inclusion of header files

Answer

Defines a macro

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Checks for syntax errors

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Excludes code

Question 5

In C, what is the purpose of the #ifdef directive?

Accepted Answer

Checks if a macro is defined

Answer

Checks if a macro is not defined

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Defines a macro

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Includes a header file

Question 6

What is the purpose of the #pragma warning directive in C preprocessing?

Accepted Answer

Generates a warning message

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Defines a macro

Answer

Checks for syntax errors

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Excludes code

Question 7

In C preprocessing, what is the purpose of the #elifdef directive?

Accepted Answer

Provides an alternative condition

Answer

Checks if a macro is defined

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Checks if a macro is not defined

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Defines a macro

Question 8

What is the result of the #pragma message directive in C preprocessing?

Accepted Answer

Includes a message in the code

Answer

Defines a macro

Answer

Checks for syntax errors

Answer

Excludes code

Question 9

What is the purpose of the #undef directive in C preprocessing?

Accepted Answer

Undefines a macro

Answer

Defines a macro

Answer

Checks for syntax errors

Answer

Excludes code