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The #else Directive

The #else directive can be added to a conditional to provide alternative text to be used if the condition is false. The following is what it resembles.

    #if expression
    text-if-true
    #else /* Not expression */

    text-if-false

    #endif /* Not expression */

If expression is nonzero, and thus the text-if-true is active, then #else acts like a failing conditional and the text-if-false is ignored. Contrarily, if the #if conditional fails, the text-if-false is considered included.