C Preprocessor - C Programming MCQ Questions and Answers

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

A) #ifndef MACRO B) #ifndef(MACRO) C) #ifndef:MACRO D) #ifndef: MACRO

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Answer & Solution

Answer: Option A

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

A) Prevents multiple inclusion of header files B) Defines a macro C) Checks for syntax errors D) Excludes code

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Answer & Solution

Answer: Option A

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

A) Checks if a macro is defined B) Checks if a macro is not defined C) Defines a macro D) Includes a header file

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Answer & Solution

Answer: Option A

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

A) Generates a warning message B) Defines a macro C) Checks for syntax errors D) Excludes code

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Answer & Solution

Answer: Option A

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

A) Checks if a macro is defined B) Checks if a macro is not defined C) Provides an alternative condition D) Defines a macro

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Answer & Solution

Answer: Option C

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

A) Includes a message in the code B) Defines a macro C) Checks for syntax errors D) Excludes code

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Answer & Solution

Answer: Option A

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

A) Undefines a macro B) Defines a macro C) Checks for syntax errors D) Excludes code

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Answer & Solution

Answer: Option A

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

A) Checks if a macro is defined B) Checks if a macro is not defined C) Provides an alternative condition D) Defines a macro

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Answer & Solution

Answer: Option B

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

A) Generates a warning message B) Defines a macro C) Checks for syntax errors D) Excludes code

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Answer & Solution

Answer: Option A

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

A) Specifies the line number and filename in the source file B) Defines a macro C) Checks for syntax errors D) Excludes code

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Answer & Solution

Answer: Option A

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