C #undef

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The undefine a macro helps to cancel its definition. This is done with the #undef directive.

Syntax:

#undefine token

Example:

#include <stdio.h>
#define PI 3.14
#undef PI
void main() {
	printf("Print the pi value :");
    printf("%d",PI);
}

 

error: ‘PI’ undeclared

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