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\ -> Commands -> #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.


[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.


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

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My whole website and this manual itself was developed using PPWIZARD (free preprocessor written by Dennis Bareis)
Sunday November 05 2017 at 10:00am