#include <iostream>
#include <cstdlib>
#include <iomanip>   //for setprecision
using namespace std;

float pi_float();
double pi_double();

int main()
{
	cout << setprecision(19)
		<< "float       " << pi_float() << "\n"
		<< "double      " << pi_double() << "\n";

	return EXIT_SUCCESS;
}

float pi_float()
{
	float pi = 0;
	float sign = 1;
	const long n = 1000000;

	for (long i = 1; i < n; i += 2) {
		pi += sign / i;
		sign = -sign;
	}

	pi += sign / (2 * n);
	return 4 * pi;
}

double pi_double()
{
	double pi = 0;
	double sign = 1;
	const long n = 1000000;

	for (long i = 1; i < n; i += 2) {
		pi += sign / i;
		sign = -sign;
	}

	pi += sign / (2 * n);
	return 4 * pi;
}