计算定期还款额度

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
double rate,payment,payPerYear,principal,numYears;/*rate代表利率，principal代表本金，payPerYear代表每年偿还贷款的次数，numYears代表贷款的年限*/
cout<<"请输入贷款本金：";
cin>>principal;
cout<<"请输入贷款年限：";
cin>>numYears;
cout<<"请输入贷款利率：";
cin>>rate;
cout<<"请输入每年还款次数：";
cin>>payPerYear;
payment=rate*principal/payPerYear/(1-pow(rate/payPerYear+1,-payPerYear*numYears));
cout<<"每次偿还额度："<<payment;
return 0;


}