PPWIZARD is a free preprocessor for HTML, REXX, Visual Basic or any text files.
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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]#define  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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PPWIZARD Manual
My whole website and this manual itself was developed using PPWIZARD (free preprocessor written by Dennis Bareis)
Thursday January 17 2002 at 6:27pm