package compounding;

import java.util.Scanner;

public class compounding1_1 {

    public static void main(String[] args) {

        // TODO 自动生成的方法存根

        //tip();

        while (true) {

            menu();

            System.out.printf("请输入你要选择的功能(0~7):");

            int n = scanner.nextInt();

            if (n >=  && n <= ) {

                if (n == )

                    break;

                switch (n) {

                case :

                    Year_end_value();

                    break;

                case :

                    principal();

                    break;

                case :

                    danli();

                    break;

                case :

                    years();

                    break;

                case :

                    APY();

                    break;

                case :

                    Investment();

                    break;

                case :

                    Repayment();

                    break;

                case :

                    n = ;

                    break;

                }

            }

        }

}

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

static void menu()// 菜单

{

    System.out.printf("\t\t|-----------------------------------|\n");

    System.out.printf("\t\t|             welcome               |\n");

    System.out.printf("\t\t|-----------------------------------|\n");

    System.out.printf("\t\t|           1、计算年复利终值                                 |\n");

    System.out.printf("\t\t|           2、计算本金                                             |\n");

    System.out.printf("\t\t|           3、单利计算                                             |\n");

    System.out.printf("\t\t|           4、计算年份                                             |\n");

    System.out.printf("\t\t|           5、计算年利率                                         |\n");

    System.out.printf("\t\t|           6、等额定投                                             |\n");

    System.out.printf("\t\t|           7、等额还款                                             |\n");

    System.out.printf("\t\t|           0、退出系统                                             |\n");

    System.out.printf("\t\t|-----------------------------------|\n");

}

static void principal()// 计算本金

{

    int year, n;

    double q, F, P;

    System.out.printf("复利终值:");

    F = scanner.nextDouble();

    System.out.printf("年利率:");

    q = scanner.nextDouble();

    System.out.printf("存入年限:");

    year = scanner.nextInt();

    System.out.printf("年复利次数:");

    n = scanner.nextInt();

    //P = capital_formula(F, i, N, m);

    P = F / Math.pow(( + q / n), year * n);

    System.out.println("年复利终值为" + F + "需要本金为:" + P);

}

static void Year_end_value()// 计算复利终值

{

    int year, n;

    double q, F, P;

    System.out.printf("存入本金:");

    P = scanner.nextDouble();

    System.out.printf("年利率:");

    q= scanner.nextDouble();

    System.out.printf("存入年限:");

    year = scanner.nextInt();

    System.out.printf("年复利次数:");

    n = scanner.nextInt();

    F = P * Math.pow(( + q / n), year * n);

    System.out.println("复利终值:" + F);

}

static void danli()// 单利计算

{

    int year;

    double q, F, P;

    System.out.printf("存入本金:");

    P = scanner.nextDouble();

    System.out.printf("年利率:");

    q = scanner.nextDouble();

    System.out.printf("存入年限:");

    year = scanner.nextInt();

    F = P + P * year * q;

    System.out.println("本息和为:" + F);

}

static void years()// 求年份

{

    int year, n;

    double q, 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:");

    q = scanner.nextDouble();

    System.out.printf("年复利次数:");

    n = scanner.nextInt();

    year = (int) (Math.log(F / P) / Math.log( + q / n) / n);

    System.out.println("从" + P + "到" + F + "需要" + year + "年");

}

static void APY()// 计算年利率

{

    int year, n;

    double q, 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();

    System.out.printf("年复利次数:");

    n = scanner.nextInt();

    q = n * (Math.pow(F / P, 1.0 / (year * n)) - );

    System.out.println("从" + P + "到" + F + "需要" + q);

}

static void Investment()// 计算等额投资

{

    int n;

    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 == ) {

        Investmentyear();

    } else if (n == ) {

        Investmentmonth();

    } else {

        System.out.printf("输入有误!\n");

    }

}

static void Investmentyear(){

    int year;

    double q, final_value, P;

    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:");

    q = scanner.nextDouble();

    final_value = P * (Math.pow( + q, year) - ) /q;

    System.out.println(year + "年后的总产值:" + final_value);

}

static void Investmentmonth(){

    int year;

    double q, final_value, P;

    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:");

    q = scanner.nextDouble();

    final_value = P *  * ( + q) * (Math.pow( + q, year) - ) / q;

    System.out.println(year + "年后的总产值:" + final_value);

}

static void Repayment()// 等额还款

{

    int year;

    double q, F, refund;

    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:");

    q = scanner.nextDouble();

    refund = F * q / ( * ( + q) * (Math.pow( + q, year) - ));

    System.out.println("贷款" + F + "每月需要还款" + refund);

}

}