Discussion
Which of the following are correct preprocessor directives in C?
1. #ifdef
2. #if
3. #elif
4. #undef
Answer: D
Correct answer: 1, 2, 3, 4
All four are real directives: #ifdef tests whether a macro is defined, #if evaluates a constant expression, #elif is the “else if” of the conditional group, and #undef removes a definition.
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