Discussion
Preprocessor directive #undef can be used only on a macro that has been #define earlier
Answer: A
Correct answer: True
#undef does one thing: it removes an existing macro definition. Applied to a name that was never defined it has nothing to remove and is simply ignored, so the directive is meaningful only for a macro defined earlier. Its usual purpose is to redefine a macro safely - #undef then #define - or to stop a macro shadowing a real function name.
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