Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Directive:  #undef
 
  Syntax:     #undef identifier
 
  Summary:    Removes the current definition of <identifier>, which
              must have been previously defined with the #define
              directive.
 
  See also:   #define, defined, #if, #ifdef, #ifndef
                                    -♦-