C Preprocessor - C Programming MCQ Questions and Answers

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

A) To check if a variable is declared B) To conditionally include code C) To include a header file D) To define a macro

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Answer & Solution

Answer: Option B

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In C, how do you use the #ifdef directive to conditionally include code if a macro is defined?

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

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Answer & Solution

Answer: Option A

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

A) To include an error message in the code B) To define a macro C) To check if a variable is declared D) To conditionally compile code

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Answer & Solution

Answer: Option A

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What is the result of the #ifndef DEBUG directive if the DEBUG macro is defined?

A) The code block following it is included B) The code block following it is excluded C) It generates a compilation error D) It defines the DEBUG macro

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Answer & Solution

Answer: Option B

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Which directive in C preprocessing is used to concatenate two or more strings?

A) #concat B) #strcat C) #combine D) #define

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Answer & Solution

Answer: Option D

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In C, what does the #line directive do in C preprocessing?

A) Specifies the line number in the source file B) Defines a macro C) Includes a header file D) Excludes code

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Answer & Solution

Answer: Option A

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

A) Prevents recursive 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 preprocessing, what is the purpose of the #elif 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 #error directive in C preprocessing?

A) Generates a compilation error with a specified error 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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What is the purpose 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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