复利计算程序之最新版

程序源代码已上传至https://github.com/ganjiaping/ganjiaping.git，同时Github上的Wiki页面，有说明如何部署运行该项目/程序。

源程序如下：

import java.util.*;

public class FuLiLast {
    public static double b, l, n, h;

    // 计算本息和
    public static void Benxihe() {
        double sum1, sum2;
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入本金: ");
        b = scanner.nextDouble();
        System.out.println("请输入年利率: ");
        l = scanner.nextDouble();
        System.out.println("请输入年数: ");
        n = scanner.nextInt();
        sum1 = (float) (b * Math.pow(1 + l, n));
        sum2 = b * (1 + l * n);
        System.out.println("复利的本息和为： "
                + (double) (Math.round(sum1 * 100) / 100.0));
        System.out.println("单利的本息和为： "
                + (double) (Math.round(sum2 * 100) / 100.0));
    }

    // 计算本金
    public static void Benjin() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入年利率: ");
        l = scanner.nextDouble();
        System.out.println("请输入年数: ");
        n = scanner.nextInt();
        System.out.println("请输入本息和: ");
        h = scanner.nextDouble();
        b = (float) (h * 1 / Math.pow(1 + l, n));
        System.out.println("本金为： " + (double) (Math.round(b * 100) / 100.0));
    }

    // 计算年数
    public static class Logarithm {
        public static double log(double value, double base) {
            return Math.log(value) / Math.log(base);
        }
    }

    public static void Nianshu() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入本金: ");
        b = scanner.nextDouble();
        System.out.println("请输入年利率: ");
        l = scanner.nextDouble();
        System.out.println("请输入本息和: ");
        h = scanner.nextDouble();
        n = Logarithm.log(h / b, 1 + l);
        n = Math.ceil(n);
        System.out.println("需要存的年数为: " + Math.ceil(n));
    }

    // 计算年利率
    public static void Lilu() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入本金: ");
        b = scanner.nextDouble();
        System.out.println("请输入年数: ");
        n = scanner.nextInt();
        System.out.println("请输入本息和: ");
        h = scanner.nextDouble();
        l = Math.pow(h / b, 1.0 / n) - 1;
        System.out
                .println("年报酬率为： " + (double) (Math.round(l * 1000) / 1000.0));
    }

    // 计算本利之和连同年金投资后的总资产值
    public static void Nianzongzhi() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入每年定投资金: ");
        b = scanner.nextDouble();
        System.out.println("请输入年利率: ");
        l = scanner.nextDouble();
        System.out.println("请输入年数: ");
        n = scanner.nextInt();
        h = b * (1 + l) * (Math.pow(1 + l, n) - 1) / l;
        System.out.println("年资产总值为：" + (double) (Math.round(h * 100) / 100.0));
    }

    // 计算每月等额本息还款
    public static void BenxiHuankuan() {
        double h, l, b;
        int n;
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入贷款金额: ");
        h = scanner.nextDouble();
        System.out.println("请输入年利率: ");
        l = scanner.nextDouble();
        System.out.println("请输入贷款年数: ");
        n = scanner.nextInt();
        l = l / 12;
        n = n * 12;
        b = h * l * Math.pow(1 + l, n) / (Math.pow(1 + l, n) - 1);
        System.out.println("每月等额本息还款为："
                + (double) (Math.round(b * 10000) / 10000.0));
    }

    public static void main(String[] args) {
        int choice;
        while (true) {
            System.out.println("\t\t|------------------|");
            System.out.println("\t\t|  1.求本息和                               |");
            System.out.println("\t\t|  2.求本金                                   |");
            System.out.println("\t\t|  3.求年数                                   |");
            System.out.println("\t\t|  4.求年利率                               |");
            System.out.println("\t\t|  5.求年资产总值                       |");
            System.out.println("\t\t|  6.求等额本息还款                   |");
            System.out.println("\t\t|  7.退出                                       |");
            System.out.println("\t\t|------------------|");
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入你的选择(1~7):  ");
            choice = scanner.nextInt();
            switch (choice) {
            case 1:
                Benxihe();
                break;
            case 2:
                Benjin();
                break;
            case 3:
                Nianshu();
                break;
            case 4:
                Lilu();
                break;
            case 5:
                Nianzongzhi();
                break;
            case 6:
                BenxiHuankuan();
                break;
            case 7:
                System.out.println("欢迎再次使用!");
                System.exit(0);
                break;
            default: {
                System.out.println("出错了!");
                break;
            }
            }
        }
    }
}

运行结果如下：