#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

no equivalent in PBASIC
no equivalent in Visual BASIC, but may be done with C-pre-processor