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_______________ is the preprocessor directive which is used to end the scope of #ifdef.

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_______________ is the preprocessor directive which is used to end the scope of #ifdef.

(a) #elif

(b) #ifndef

(c) #endif

(d) #if

I got this question during an interview.

This intriguing question originated from Conditional Preprocessor Directives topic in chapter C Preprocessor of C

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Correct option is (c) #endif

To explain: The #ifdef preprocessor directive is used to check if a particular identifier is currently defined or not.  If the particular identifier is defined, the statements following this preprocessor directive are executed till another preprocessor directive #endif is encountered. #endif is used to end the scope of #ifdef.

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