#undef

 
Syntax


#undef IDname 

Description


This statement directs the pre-processor to forget the word IDname for pre-processing. 

So #ifdef IDname will now evaluate to FALSE.

Example

#define COMPILETHIS 

  '... 

#ifdef COMPILETHIS

  '... will now be included 

#endif


#undef COMPILETHIS

#ifdef COMPILETHIS 

   '... will now not be included

#endif
Differences from other BASICs

See also