20_pi.cpp

#include <iostream>
#include <cmath>
using namespace std;

int main(){
	cout << "M_PI: " << M_PI << endl; // pi
	cout << "M_PI_2: "  << M_PI_2 << endl; // pi/2
	cout << "M_PI_4: " <<  M_PI_4 << endl; // pi/4
	cout << "M_1_PI: " <<  M_1_PI << endl; // 1/pi	
	cout << "M_2_PI: " <<  M_2_PI << endl; // 2/pi
	cout << "M_2_SQRTPI: "  << M_2_SQRTPI << endl; // 2/sqrt(pi)	
	cout << "M_SQRT2: "  << M_SQRT2 << endl; // sqrt(2)	
	cout << "M_SQRT1_2: " << M_SQRT1_2 << endl; // 1/sqrt(2)	
	cout << "M_E: "  << M_E << endl; // e
	cout << "M_LOG2E: "  << M_LOG2E << endl; // log_2(e)	
	cout << "M_LOG10E: " <<  M_LOG10E << endl; // log_10(e)	
	cout << "M_LN2: "  << M_LN2 << endl; // log_e(2)	
	cout << "M_LN10: " <<  M_LN10 << endl; // log_e(10)	
	
}