C++：实现计算贷款支付额问题

#include<iostream>
#include<math.h>

using namespace std;

int main()
{
	int year = 0;//贷款年数
	double annualRate = 0;//年利率
	double loanSum = 0;//贷款总额
	double monthRate = 0;//月利率
	double totalPay = 0;//总支付额
	double monthPay = 0;//月支付额

	cout << "请输入年贷款利率，如5.75：";
	cin >> annualRate;

	cout << "请输入贷款年限，如7：";
	cin >> year;

	cout << "请输入贷款总额，如10000：";
	cin >> loanSum;

	monthRate = annualRate / (12 * 100);//计算月利率
	monthPay = loanSum*monthRate/(1 - 1 / pow(1 + monthRate, year * 12));//计算月支付额
	totalPay = monthPay * 12 * year;//计算还款总额

	cout << "\n每月需还款：" << monthPay << endl;
	cout << "一共需要还款：" << totalPay << endl;
	
	return 0;
}