Discussion
The preprocessor directive which is used to remove the definition of an identifier which was previously defined with #define?
Answer: B
Correct answer: #undef
#undef NAME removes an existing macro definition. After it, the identifier is once again an ordinary token - and, usefully, #ifdef NAME becomes false. It is also the way to redefine a macro safely, since redefining with a different body and no #undef in between is not strictly conforming.
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