【c++】现有三个函数（1）double Add(double a) (2)double Add(double a,double b) (3)……

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• 使用C++,求pi的近似值用下面的公式求pi的近似值pi/4 = 1-1/3+1/5-1/7+.直到最后一项的绝对值小于10的-7次方为止如下式我自己编的#include "stdafx.h"#include "iostream"#include "cmath"#include "conio.h"using namespace std;int _tmain(int argc,_TCHAR* argv[]){int n = 1;double P = 0,pi;for(n=1;1/(2*n-1) {P += ((-1)^(n+1))*(1/(2*n-1));}pi = P*4;cout
• 【c++】现有三个函数（1）double Add(double a) (2)double Add(double a,double b) (3)……
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