how to include pi in c++ code example

Example: pi in c++

#define _USE_MATH_DEFINES // must include this!
 
#include <cmath>
#include <iostream>
 
int main() { 
  // M_PI = 3.14159265358979323846;
  std::cout << M_PI << " " << M_E << " " << M_SQRT2 << endl;
  return 0;
}