Algorithme Pi

#include "stdafx.h"
#include <iostream>

using namespace std;

int main()
{
    cout.precision(20);

    //Version 1
    double pi = 0;
    double diviseur;
    double resultatDivision;

    for (int i = 0; i < 2000000000; i++)
    {
        diviseur = 2 * i;
        diviseur++;
        resultatDivision = 1 / diviseur;

        if (i % 2 == 1)
            pi -= resultatDivision;
        else if (i % 2 == 0)
            pi += resultatDivision;
    }
    cout << pi * 4 << endl;

    //Version 2
    double pi = 0;

    for (double i = 1; i < 10000000000; i+=4)
    {
        pi += 4 / i;
    }

    for (double i = 3; i < 10000000000; i += 4)
    {
        pi -= 4 / i;
    }
    cout << pi << endl;

    system("Pause");
    return 0;
}