C Preprocessor - C Programming MCQ Questions and Answers

1

What is the purpose of the C preprocessor in C programming?

A) Compile C code B) Optimize code C) Preprocess code before compilation D) Execute code

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Answer & Solution

Answer: Option C

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2

Which directive is used to include the contents of another file in a C program using the C preprocessor?

A) #define B) #include C) #ifdef D) #pragma

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Answer & Solution

Answer: Option B

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3

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

A) To include a header file B) To define a macro C) To declare a constant D) To declare a variable

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Answer & Solution

Answer: Option B

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4

In C, which directive is used to conditionally include code based on preprocessor macros?

A) #ifdef B) #ifndef C) #if D) #else

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Answer & Solution

Answer: Option C

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5

What is the result of the #ifdef 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 A

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6

Which directive in C preprocessing is used to define a macro with parameters?

A) #define B) #ifdef C) #include D) #if

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Answer & Solution

Answer: Option A

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7

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

A) To undefine a macro B) To include a header file C) To define a macro D) To declare a variable

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Answer & Solution

Answer: Option A

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8

What does the #ifndef directive do in C preprocessing?

A) Checks if a macro is defined B) Checks if a macro is not defined C) Checks if a variable is declared D) Checks if a function is defined

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Answer & Solution

Answer: Option B

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9

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

A) Includes a header file B) Provides compiler-specific instructions C) Defines a macro D) Checks for syntax errors

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Answer & Solution

Answer: Option B

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10

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

A) To define a macro B) To include a header file C) To declare a variable D) To conditionally compile code

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Answer & Solution

Answer: Option B

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