0330 复利程序c语言版转java版 会逐渐更进版

import java.util.Scanner;

public class compounding {

    public static void main(String[] args) {
        menu();
        int m = scanner.nextInt();
        switch(m)
        {
        case 1:
            compound_calate(); break;
        case 2:
            single_calate();break;
        }

    }

    private static void compound_calate() {//复利计算

        while (true) {
            System.out.println("");

            menu1();
            int n = scanner.nextInt();
            if (n >= 0 && n <= 6) {
                if (n == 0)
                    System.exit(0);
                switch (n) {
                case 1:
                    principal();
                    break;
                case 2:
                     compound_final();
                    break;
                case 3:
                    time();
                    break;
                case 4:
                    annual_interest_rate();
                    break;
                case 5:
                    equal_investment();
                    break;
                case 6:
                    Average_repayment();
                    break;

                }

            } else {
                System.out.println("输入超出范围，请重新输入:");
            }
        }

    }

    static Scanner scanner = new Scanner(System.in);

    static void menu()// 功能介绍函数
    {
        System.out.printf("\t\t|******************************************************|\n");
        System.out.printf("\t\t|                     利息计算系统                                                            |\n");
        System.out.printf("\t\t|******************************************************|\n");
        System.out.printf("\t\t|                    1: 复利计算                                                              |\n");
        System.out.printf("\t\t|                    2: 单利计算                                                              |\n");
        System.out.printf("\t\t|******************************************************|\n");
        System.out.printf("\t请选择<1~2>:");
    }

    static void menu1()// 菜单
    {
        System.out.printf("\t\t|******************************************************|\n");
        System.out.printf("\t\t|                    1: 本金计算                                                                |\n");
        System.out.printf("\t\t|                    2: 终值计算                                                               |\n");
        System.out.printf("\t\t|                    3: 期数计算                                                               |\n");
        System.out.printf("\t\t|                    4: 利率计算                                                               |\n");
        System.out.printf("\t\t|                    5: 定期计算                                                               |\n");
        System.out.printf("\t\t|                    6: 等额本息还款                                                       |\n");
        System.out.printf("\t\t|******************************************************|\n");
        System.out.printf("请输入你要选择的功能(1~6):");

    }

    static double principal_formula(double S, double i, int Year)// 本金计算公式
    {
        double P;
        P = S/ Math.pow((1 + i ), Year);
        return P;
    }

    static void principal()// 计算本金
    {
        int Year;
        double i,P,S;
        System.out.printf("输入期待复利终值:");
        S = scanner.nextDouble();
        System.out.printf("年利率:");
        i = scanner.nextDouble();
        System.out.printf("存入年限:");
        Year = scanner.nextInt();
        P = principal_formula(S, i, Year);
        System.out.println("年复利终值为" + S + "需要本金为:" + P);
    }

    static double compound_amount_formula(double P, double i, int Year)// 复利计算公式
    {
        double F;
        F = P * Math.pow((1 + i ),Year);
        return F;
    }

    static void compound_final()// 计算复利终值
    {
        int Year;
        double i, F, P;
        System.out.printf("请输入本金：");
        P = scanner.nextDouble();
        System.out.printf("请输入年利率：");
        i = scanner.nextDouble();
        System.out.printf("请输入复利次数（年）：");
        Year = scanner.nextInt();
        F = compound_amount_formula(P, i, Year);
        System.out.println("复利终值:" + F);
    }

    static double single_interest_formula(double P, int Year, double i)// 单利计算公式
    {
        double F;
        F = P *(1+i*Year);
        return F;
    }

    static void single_calate()// 单利计算
    {
        int Year;
        double i, F, P;
        System.out.printf("存入本金:");
        P = scanner.nextDouble();
        System.out.printf("年利率:");
        i = scanner.nextDouble();
        System.out.printf("存入年限:");
        Year = scanner.nextInt();
        F = single_interest_formula(P, Year, i);
        System.out.println("本息和为:" + F);
    }

    static int years_formula(double F, double P, double i)// 根据复利终值求年份
    {
        int year;
        year = (int) (Math.log(F / P) / Math.log(1 + i ));
        return year;
    }

    static void time()// 求年份
    {
        int Year;
        double i, F, P;
        System.out.printf("复利终值:");
        F = scanner.nextDouble();
        System.out.printf("存入本金:");
        P = scanner.nextDouble();
        System.out.printf("年利率:");
        i = scanner.nextDouble();
        Year= years_formula(F, P, i);
        System.out.println("从" + P + "到" + F + "需要" + Year+ "年");
    }

    static double rate_formula(double F, double P, int Year)// 复利的利率计算公式
    {
        double rate;
        rate = (Math.pow(F / P, 1.0 / Year) - 1);
        return rate;
    }

    static void annual_interest_rate()// 计算年利率
    {
        int Year;
        double i, F, P;
        System.out.printf("复利终值:");
        F = scanner.nextDouble();
        System.out.printf("存入本金:");
        P = scanner.nextDouble();
        System.out.printf("存入年限:");
        Year = scanner.nextInt();
        i = rate_formula(F, P, Year);
        System.out.println("从" + P + "到" + F + "需要" + i);
    }

    static double equal_investment_years(double P, int Year, double i)// 按照年份等额投资计算公式
    {
        double final_value;
        final_value = P * (Math.pow(1 + i, Year) - 1) / i;
        return final_value;
    }

    static double equal_investment_months(double P, int Year, double i)// 按照月份等额投资计算公式
    {
        double final_value;
        final_value = P * 12 * (1 + i) * (Math.pow(1 + i, Year) - 1) / i;
        return final_value;
    }

    static void equal_investment()// 计算等额投资
    {
        int Year, n;
        double i, F, P;
        System.out.printf("\t\t1:按年投资\n\t\t2:按月投资\n");
        System.out.printf("请选择你要的功能<1|2>:");
        n = scanner.nextInt();
        if (n == 1) {
            System.out.printf("存入本金:");
            P = scanner.nextDouble();
            System.out.printf("存入年限:");
            Year = scanner.nextInt();
            System.out.printf("年利率:");
            i = scanner.nextDouble();
            F = equal_investment_years(P, Year, i);
            System.out.println(Year+ "年后的总产值:" + F);

        } else if (n == 2) {
            System.out.printf("存入本金:");
            P = scanner.nextDouble();
            System.out.printf("存入年限:");
            Year = scanner.nextInt();
            System.out.printf("月利率:");
            i = scanner.nextDouble();
            F = equal_investment_months(P, Year, i);
            System.out.println(Year + "年后的总产值:" + F);
        } else {
            System.out.printf("输入有误!\n");
        }

    }

    static double equal_repayment_formula(double F, int Year,double i)// 等额还款公式
    {
        double refund;
        refund = F * i / (12 * (1 + i) * (Math.pow(1 + i, Year) - 1));
        return refund;
    }

    static void Average_repayment()// 等额还款
    {
        int Year;
        double i, F, P;
        System.out.printf("贷款金额:");
        F = scanner.nextDouble();
        System.out.printf("存入年限:");
        Year = scanner.nextInt();
        System.out.printf("年利率:");
        i = scanner.nextDouble();
        P = equal_repayment_formula(F, Year, i);
        System.out.println("贷款" + F + "每月需要还款" + P);
    }

}