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What does preprocessor directive #if and #endif explains?

What does preprocessor directive #if and #endif explains? Correct Answer All of the mentioned

The #if and #endif directives enable conditional compilation of a sequence of code based upon whether an expression involving one or more symbols evaluates to true. A symbol is true if it has been defined. It is false otherwise. If the expression following #if is true, the code that is between it and #endif is compiled. Otherwise, the intervening code is skipped. The #endif directive marks the end of an #if block.

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