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