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
Answer: Option A
This Question Belongs to C Program >> C Preprocessor
Related Questions on C Preprocessor
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
A. #define
B. #include
C. #ifdef
D. #pragma
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
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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