| #else

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The `#else` directive can be added to a conditional to provide alternative text to be used if the condition fails. This is what it looks like:

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

If expression is nonzero, the text-if-true is included and the text-if-false is skipped. If expression is zero, the opposite happens.
You can use `#else` with `#ifdef` and `#ifndef`, too.