大家帮忙看下这个程序出什么问题了!

#include <iostream>
#include <conio.h>

using std::cin;
using std::cout;
using std::endl;

double Mass(double T,double R);
double Power(double X,int n);

int main(void)
{
    double T;
    double R;

    cout << "请输入周期:";
    cin >> T;
    cout << "请输入轨道半径:";
    cin >> R;

    cout << "中心天体的质量为\"" <<Mass(T,R) << ".";
    cout << endl
            << "press any key. . .";

    _getch();
    return 0;
}

double Mass(double T,double R)
{
    double reasult;
    double G = 6.67 * Power(10,-11);
    reasult = ( (4 * Power(3.14,2) * Power(R,3) ) ) / (G * Power(T,2));

    return reasult;
}

double Power(double X,int n)
{
    double reasult;
    if(n < 0)
    {   
        X = 1/X;
        n = -n;
    }
    if(n > 0)
    {
        reasult = X * Power(X,n-1);
    }
    else
        return 1.0;
    return reasult;
}


为什么会出现这样的结果,有什么解决方法吗?