![]() The #if, #elif, #else, and #endif directives can nest in the text portions of other #if directives. The #else directive, if present, must be the last directive before #endif. Any number of #elif directives can appear between the #if and #endif directives, but at most one #else directive is allowed. If-part elif-parts opt else-part opt endif-lineĮach #if directive in a source file must be matched by a closing #endif directive. ![]() If the expression you write (after the #if) has a nonzero value, the line group immediately following the #if directive is kept in the translation unit. ![]() The #if directive, with the #elif, #else, and #endif directives, controls compilation of portions of a source file.
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