Explain the #undef directive, C/C++ Programming

Explain the #undef directive, C/C++ Programming

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The #undef Directive

This directive undefines a previously explained macro. For, example the following will give an error since PI is undefined.

#define PI 3.14285

void main()

{

cout<< PI; // no error here

# undef PI;

cout << PI; // error after undef.

}

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