C Preprocessor

Which of the following are correct preprocessor directives in C?

1: #ifdef

2: #if

3: #elif

4: #undef

A 1, 2

B 4

C 1, 2, 4

D 1, 2, 3, 4

ANS:D - 1, 2, 3, 4

The macros #ifdef #if #elif are called conditional macros. The macro #undef undefine the previosly declared macro symbol. Hence all the given statements are macro preprocessor directives.

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