Topic       : C-Language Documentation
Author      : John Kormylo
Version     : C.HYP 1.0
Subject     : Documentation/C-Language
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Index Size  : 6362
HCP-Version : 3
Compiled on : Atari
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@lang       : en
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View Ref-File[ #undef ]

Stops macro expansion, resets macro name to be undefined.  (Must be
used before the macro name can be redefined.)  Syntax:

  #undef 'macro'

where 'macro' is a previously defined macro name.

See also Preprocessor, Names and #define.