题目

代码

#include <bits/stdc++.h> 
using namespace std;

int main()
{
    double pai = 0;
    for (int count = 1, i = 1; count <= 1000; i += 2, count++)
    {
        int flag = 1;
        if (count % 2 == 0)
        {
            flag = -1;
        }

        pai += flag * (4.0 / (i * 1.0));
        cout << "当取前" << count << "项时，Π近似值为" <<setprecision(15)<< pai << endl;
    }
    return 0;
}

运行截图