### #else Preprocessor Directive

If the condition specified in the #if, #ifdef, or #ifndef directive evaluates to 0, and the conditional compilation directive contains a preprocessor #else directive, the source text located between the preprocessor #else directive and the preprocessor #endif directive is selected by the preprocessor to be passed on to the compiler.

Conditional Compilation Directives
Preprocessor Directives

#elif Preprocessor Directive
#endif Preprocessor Directive
#if Preprocessor Directive
#ifdef Preprocessor Directive
#ifndef Preprocessor Directive
List of Preprocessor Directives