Topic       : C-Language Documentation
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View Ref-File[ #elif ]

Must be used after an #if #ifdef #ifndef or #elif directive.

  #elif 'logical expression'

where 'logical expression' can use any of the Logical Operators
plus:

  defined('macro')   /* TRUE if 'macro' name is defined */

If the logical expression is TRUE (!0), then compilation resumes.
If the logical expression is FALSE (0), then compilation stops until
the next '#else' '#elif' or '#endif' directive.

#elif acts like a combination of #else and #if, except that
several of them can be used with only one #endif; e.g.,

#if            instead of          #if
#elif                              #else
#elif                              # if
...                                # else
#else                              ...
#endif                             # endif
                                   #endif

See also Preprocessor.