The #else directive marks an optional clause of a conditional-compilation block defined by a #ifdef, #ifndef, or #if directive. The #else directive must be the last directive before the #endif directive.
#else
This directive has no parameters.
This example compiles the second BITMAP statement only if the name DEBUG
is not defined:
#ifdef DEBUG
BITMAP 1 errbox.bmp
#else
BITMAP 1 userbox.bmp
#endif
#elif, #endif, #if, #ifdef, #ifndef