The C Preprocessor
#else' Directive
The `#else' directive can be added to a conditional to provide
alternative text to be used if the condition is false. This is what
it looks like:
#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. Contrariwise, if the `#if'
conditional fails, the text-if-false is considered included.
The C Preprocessor
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