value of pai in series.cpp

#include<iostream>
using namespace std;

int main()
{

    int i ;
    int count = 0 ;
    double pi = 4.0 ;

    for (i = 3 ; i <= 1000 ; i += 2)
    {

        if (count % 2 == 0)
        {
            pi-= 4.0 /(double)i;
            cout<<"\t"<<pi;
        }

        else
        {
            pi+=4.0/(double)i;
            cout<<"\t"<<pi;
        }

        count++;
    }

    return 0;
}