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#undef

A #undef command allows you to remove a definition so that it can be redefined without producing the warning message it normally will generate.

Syntax

[WhiteSpace]#undef  Variable

The "Variable" indicates which variable is to be removed (macro references are first replaced).

No warning is displayed if the symbol did not originally exist.

Example

#define Fred   Its value
#undef  Fred;
#define Fred   Its new value

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Saturday May 28 2022 at 2:55pm