计算π值

#include<iostream>#include<cmath>#include<cstring>#include<iomanip>using namespace std;//计算π值 double PI();int main(){    cout << fixed << showpoint << setprecision(8);//控制小数点后位数     cout<<PI();    return 0;}double PI(){    int n=1;    double total=0;    for(int i=0;i<10000;i++)    {        int s=2*i+1;        total+=pow(-1,i)*4.0/s;    }    return total;}

运行效果如下