Using the inbuilt PI value

//updated on 12/19/2021

In the header add following lines.

struct Pi

      {

            inline operator double() const

            {

                  double x;         // memory location to store the value

                  __asm fldpi;      // Load constant pi onto stack

                  __asm fstp x;     // create floating point store

                  return x;         //  return value

            }

      };

      static Pi PIE;

Let us say the above was added to "GenericHeader.h"

Then the following code is an example of using it.

#include <iostream>

#include "GenericHeader.h"

using namespace std; 

int main(){

double x = PIE;

cout << PIE << endl; 

  return 0; 

}