0330复利计算4.0（改）

import java.util.Scanner;

public class text {

public static void main(String[] args) {
while (true) {
Scanner scanner = new Scanner(System.in);
System.out.println("----------------------------");
System.out.println("    1.复利计算本息                          ");
System.out.println("    2.单利计算本息                          ");
System.out.println("    3.复利计算本金                          ");
System.out.println("    4.单利计算本金                          ");
System.out.println("    5.算投资年限      ");
System.out.println("    6.算投资年利率      ");
System.out.println("    7.每年定投收益                       ");
System.out.println("    8.每月定投收益                       ");
System.out.println("    9.每月等额本息还款          ");
System.out.println("    0.退出                             ");
System.out.println("----------------------------");
System.out.print("请选择：");
int number = scanner.nextInt();
switch (number) {
case 1:
BenxiFuli();
break;
case 2:
BenxiDanli();
break;
case 3:
BenjinFuli();
break;
case 4:
BenjinDanli();
break;
case 5:
TouziYear();
break;
case 6:
TouziRate();
break;
case 7:
YearDingtoushouyi();
break;
case 8:
MonthDingtoushouyi();
break;
case 9:
Dengerbenxihuanknan();
break;
case 0:
Exit();
break;
default: {
System.out.println("输入错误!请重新输入!");
break;
}
}
}

}

private static void Exit() {
// TODO 自动生成的方法存根
System.out.println("谢谢使用！");
System.exit(0);

}

private static void Dengerbenxihuanknan() {
// TODO 自动生成的方法存根
Scanner scanner = new Scanner(System.in);
System.out.print("请输入贷款本金：");
double money = scanner.nextDouble();
System.out.print("请输入年利率：");
double rate = scanner.nextDouble();
System.out.print("请输入年限：");
int year = scanner.nextInt();
double num = 1;
for (int i = 1; i <= year * 12; i++) {
num = (1 + (rate / 12)) * num;

}
money = money * ((rate / 12) * num) / (num - 1);
System.out.println("每月等额本息还款："
+ (double) (Math.round(money * 100) / 100.0));

}

private static void MonthDingtoushouyi() {
// TODO 自动生成的方法存根
Scanner scanner = new Scanner(System.in);

System.out.print("请输入每月的定投金额：");
double money = scanner.nextDouble();
System.out.print("请输入年利率：");
double rate = scanner.nextDouble();
System.out.print("请输入年限：");
int year = scanner.nextInt();
double num = 1;
for (int i = 1; i <= year * 12; i++) {
num = (1 + (rate / 12)) * num;

}
money = money * (1 + (rate / 12)) * (-1 + num) / (rate / 12);
System.out.println("定投" + year + "年后的资产总值为："
+ (double) (Math.round(money * 100) / 100.0));

}

private static void YearDingtoushouyi() {
// TODO 自动生成的方法存根
Scanner scanner = new Scanner(System.in);

System.out.print("请输入每年的投资金额：");
double money = scanner.nextDouble();
System.out.print("请输入年利率：");
double rate = scanner.nextDouble();
System.out.print("请输入年限：");
int year = scanner.nextInt();
double num = 1;
for (int i = 1; i <= year; i++) {
num = (1 + rate) * num;

}
money = money * (1 + rate) * (-1 + num) / rate;
System.out.println("定投" + year + "年后的资产总值为："
+ (double) (Math.round(money * 100) / 100.0));

}

private static void TouziRate() {
// TODO 自动生成的方法存根
Scanner scanner = new Scanner(System.in);
System.out.print("请输入投资金额：");
double money1 = scanner.nextDouble();
System.out.print("请输入收获金额：");
double money2 = scanner.nextDouble();

System.out.print("请输入年限：");
int year = scanner.nextInt();
double rate;
rate = Math.pow(money2 / money1, 1.0 / year) - 1;
System.out.println("所需年利率为："
+ (double) (Math.round(rate * 10000) / 10000.0));

}

private static void TouziYear() {
// TODO 自动生成的方法存根
Scanner scanner = new Scanner(System.in);
System.out.print("请输入投资金额：");
double money1 = scanner.nextDouble();
System.out.print("请输入收获金额：");
double money2 = scanner.nextDouble();

System.out.print("请输入年利率：");
double rate = scanner.nextDouble();
double year;
year = Logarithm.log(money2 / money1, 1 + rate);
year = Math.ceil(year);
System.out.println("需要存入的年限为：" + year);

}

private static void BenjinDanli() {
// TODO 自动生成的方法存根
Scanner scanner = new Scanner(System.in);
System.out.print("请输入本息：");
double money = scanner.nextDouble();
System.out.print("请输入年利率：");
double rate = scanner.nextDouble();
System.out.print("请输入年限：");
int year = scanner.nextInt();
money = money * (1 / (1 + rate * year));
System.out.println("单利计算需要存入的本金为："
+ (double) (Math.round(money * 100) / 100.0));

}

private static void BenjinFuli() {
// TODO 自动生成的方法存根
Scanner scanner = new Scanner(System.in);
System.out.print("请输入本息：");
double money = scanner.nextDouble();
System.out.print("请输入年利率：");
double rate = scanner.nextDouble();
System.out.print("请输入年限：");
int year = scanner.nextInt();
double num = 1;
for (int i = 1; i <= year; i++) {
num = num * (1 + rate);
}
money = money * (1 / num);
System.out.println("复利计算需要存入的本金为："
+ (double) (Math.round(money * 100) / 100.0));

}

private static void BenxiDanli() {
// TODO 自动生成的方法存根
Scanner scanner = new Scanner(System.in);
System.out.print("请输入本金：");
double money = scanner.nextDouble();
System.out.print("请输入年利率：");
double rate = scanner.nextDouble();
System.out.print("请输入年限：");
int year = scanner.nextInt();
money = money + money * rate * year;
System.out.println("存入" + year + "年后的单利计算本息为："
+ (double) (Math.round(money * 100) / 100.0));

}

private static void BenxiFuli() {
// TODO 自动生成的方法存根
Scanner scanner = new Scanner(System.in);
System.out.print("请输入本金：");
double money = scanner.nextDouble();
System.out.print("请输入年利率：");
double rate = scanner.nextDouble();
System.out.print("请输入年限：");
int year = scanner.nextInt();
for (int i = 1; i <= year; i++) {
money = (1 + rate) * money;
}
System.out.println("存入" + year + "年后的复利计算本息为："
+ (double) (Math.round(money * 100) / 100.0));

}
}