算复利条件下等额还款金额

import java.util.Scanner;

public class exercise {

public static void main(String[] args) {
int select;
do {
System.out.println("请问您想要进行单利计算还是复利计算：1.单利 2.复利");
Scanner keyin0 = new Scanner(System.in);
select = keyin0.nextInt();
} while (select != 1 && select != 2);
System.out.println("请输入您想要存储的金额数量：");
Scanner keyin1 = new Scanner(System.in);
double originalMoney = keyin1.nextDouble();
System.out.println("请输入您想要存储金额的时间(年):");
Scanner keyin2 = new Scanner(System.in);
int year = keyin2.nextInt();
System.out.println("请输入您想要设计的年利率：");
Scanner keyin3 = new Scanner(System.in);
double rate = keyin3.nextDouble();
double sumValue = originalMoney;
if (select == 1) {
double singleValue = originalMoney * (1 + rate * year);
System.out.println("存入第" + year + "年后的存款总额为：" + singleValue);
do {
System.out.println("请问您想要计算本金问题吗：1.需要 2.不需要");
select = new Scanner(System.in).nextInt();
} while (select != 1 && select != 2);
if (select == 1) {
System.out.println("请输入您想要筹到的金额：");
singleValue = new Scanner(System.in).nextDouble();
System.out.println("请输入您想要存储金额的时间(年):");
year = new Scanner(System.in).nextInt();
System.out.println("请输入您想要设计的年利率：");
rate = new Scanner(System.in).nextDouble();
originalMoney = singleValue / (1 + rate * year);
System.out.println("需要本金" + originalMoney + "元");
}
}
else {
for (int i = 1; i <= year; i++) {
sumValue = (1 + rate) * sumValue;

}
System.out.println("存入第" + year + "年后的存款总额为：" + sumValue);
do {
System.out.println("请问您想要计算本金问题吗：1.需要 2.不需要");
select = new Scanner(System.in).nextInt();
} while (select != 1 && select != 2);
if (select == 1) {
System.out.println("请输入您想要筹到的金额：");
sumValue = new Scanner(System.in).nextDouble();
System.out.println("请输入您想要存储金额的时间(年):");
year = new Scanner(System.in).nextInt();
System.out.println("请输入您想要设计的年利率：");
rate = new Scanner(System.in).nextDouble();
for (int i = 1; i <= year; i++) {
sumValue = sumValue / (1 + rate);

}
originalMoney = sumValue;
System.out.println("需要本金" + originalMoney + "元");
}
do {
System.out.println("请问您想要计算时间问题吗：1.需要 2.不需要");
select = new Scanner(System.in).nextInt();
} while (select != 1 && select != 2);
if (select == 1) {
System.out.println("请输入您想要存储的金额数量：");
originalMoney = new Scanner(System.in).nextDouble();
System.out.println("请输入到期后您想要获取的金额：");
sumValue = new Scanner(System.in).nextDouble();
System.out.println("请输入您想要设计的年利率：");
rate = new Scanner(System.in).nextDouble();
year = 1;
for (; sumValue > originalMoney; year++) {
originalMoney = originalMoney * (1 + rate);

}
year--;
System.out.println("需要" + year + "年时间");
}
do {
System.out.println("请问您想要计算利率问题吗：1.需要 2.不需要");
select = new Scanner(System.in).nextInt();
} while (select != 1 && select != 2);
//}while (select != 1 && select != 2);
if (select == 1) {
System.out.println("请输入您想要存储的金额数量：");
originalMoney = new Scanner(System.in).nextDouble();
System.out.println("请输入到期后您想要获取的金额：");
sumValue = new Scanner(System.in).nextDouble();
System.out.println("请输入您想要存储金额的时间(年):");
year = new Scanner(System.in).nextInt();
rate = 0;
for (; Math.log(sumValue / originalMoney) / Math.log(rate + 1) > year; rate = rate + 0.0001) {
continue;
}
System.out.println("年利率应为：" + rate);

}
do {
System.out.println("请问您想要计算每年或者每月拿出固定金额投资吗：1.需要 2.不需要");
select = new Scanner(System.in).nextInt();
} while (select != 1 && select != 2);
if(select==1){
do {
System.out.println("请问您想要投资额是以月计算还是以年计算：1.月 2.年");
select = new Scanner(System.in).nextInt();
} while (select != 1 && select != 2);
if(select==1){
System.out.println("请问您想每个月定期投资多少：");
originalMoney = new Scanner(System.in).nextDouble();
System.out.println("请输入您想要设计的月利率：");
double rateMonth = new Scanner(System.in).nextDouble();
System.out.println("请输入您想要存储金额的时间(月):");
int month = new Scanner(System.in).nextInt();
sumValue=0;
for (int i = 1; i <= month; i++) {
sumValue = (1 + rateMonth) * (sumValue+originalMoney);

}
System.out.println(""+month+"个月后资产总值将变为："+sumValue);
}
if(select==2){
System.out.println("请问您想每年定期投资多少：");
originalMoney = new Scanner(System.in).nextDouble();
System.out.println("请输入您想要设计的年利率：");
rate = new Scanner(System.in).nextDouble();
System.out.println("请输入您想要存储金额的时间(年):");
year = new Scanner(System.in).nextInt();
sumValue=0;
for (int i = 1; i <=year; i++) {
sumValue = (1 + rate) * (sumValue+originalMoney);

}
System.out.println(""+year+"年后资产总值将变为："+sumValue);
}
}
do {
System.out.println("请问您想要计算贷款问题吗：1.需要 2.不需要");
select = new Scanner(System.in).nextInt();
} while (select != 1 && select != 2);
if(select==1)
{
System.out.print("请输入贷款金额：");
originalMoney=new Scanner(System.in).nextDouble();
System.out.print("请输入贷款的时间期限(年)：");
year=new Scanner(System.in).nextInt();
System.out.print("请输入贷款的年利率：");
rate=new Scanner(System.in).nextDouble();
sumValue=originalMoney;
for (int i = 1; i <= year; i++) {
sumValue = (1 + rate) * sumValue;

}

double returnPay=sumValue/(year*12);
System.out.println("每个月应该偿还"+returnPay);

}

}

}
}