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;
}

Source: quantstart.com

C++ pi float

const float pi = 2 * acos(0.0f);

Long pi in c++

typedef long double ld;
const ld pi = 3.1415926535897932384626433832795;

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