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This page displays the COHERENT manpage for #undef [Undefine a macro].

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#undef -- Preprocessing Directive

Undefine a macro
#undef identifier

The preprocessing  directive #undef tells  the C preprocessor  to disregard
identifier as a macro.  It undoes the effect of the #define directive.

See Also

#define,
C preprocessor
ANSI Standard, §6.8.3