20-2
#undef (Preprocessor Statement)
Function
Makes a symbol constant defined with #define or macro definition invalid.
Format
#undef {<Symbol constant>|<Macro name>}
Explanation
This statement makes a symbol constant defined with #define or macro
definition invalid in the program after this #undef. Designate only the macro
name for a macro with an argument.
Related Terms
#define
Example
#UNDEF NAME 'Makes NAME defined with a symbol definition or macro definition
'in the #DEFINE statement invalid.
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