复利计算器4.0 【java版】

import java.util.Scanner;

public class FuLi {

    public static void main(String[] args) {
        double N=1;
        Scanner scanner=new Scanner(System.in);
        System.out.println("请选择复利计算(1)or单利计算(2)or计算本金(3)or投资年数(4)or报酬率(5)or年资产总值(6)or月资产总值(7):");
        int choose=scanner.nextInt();

        if(choose==1){
            System.out.println("请输入本金：");
            float P=scanner.nextInt();
            System.out.println("请输入利率：");
            float i=scanner.nextFloat();
            System.out.println("存入时间：");
            float n=scanner.nextFloat();
            fuli(N, P, i, n);
        }
        if(choose==2){
            System.out.println("请输入本金：");
            float P=scanner.nextInt();
            System.out.println("请输入利率：");
            float i=scanner.nextFloat();
            System.out.println("存入时间：");
            float n=scanner.nextFloat();
            danLi(P, i,n);
        }
        if(choose==3){
            System.out.println("请输入获得金钱：");
            double total=scanner.nextDouble();
            System.out.println("请输入利率：");
            double i=scanner.nextDouble();
            System.out.println("存入时间：");
            double n=scanner.nextDouble();
            yangLaoJin(i,total,n);

        }
        if(choose==4){
            System.out.println("求存款时长\n");
            System.out.println("------------------------------\n");
            System.out.println("请输入你所存入的本金：\n");
            double P=scanner.nextDouble();
            System.out.println("------------------------------\n");
            System.out.println("请输入你所存的报酬率：\n");
            double i=scanner.nextDouble();
            System.out.println("------------------------------\n");
            System.out.println(" 到最后期望的金额：\n");
            double total=scanner.nextDouble();
            maiGuPiao(P,i,total);
        }
        if(choose==5)
        {
            System.out.println("求报酬率\n");
            System.out.println("------------------------------\n");
            System.out.println("请输入你所存入的本金：\n");
            double P=scanner.nextDouble();
            System.out.println("------------------------------\n");
            System.out.println(" 请输入你所存的存款时长：\n");
            double n=scanner.nextDouble();
            System.out.println("------------------------------\n");
            System.out.println(" 到最后期望的金额：\n");
            double total=scanner.nextDouble();
            bangZhaoTouZhi(P,n,total);
        }
        if(choose==6)
        {
            System.out.println("一定年份资金总额\n");
            System.out.println("------------------------------\n");
            System.out.println("请输入你所存入的本金：\n");
            double P=scanner.nextDouble();
            System.out.println("------------------------------\n");
            System.out.println("请输入你所存的报酬率：\n");
            double i=scanner.nextDouble();
            System.out.println("------------------------------\n");
            System.out.println("请输入你所存的存款时长：\n");
            double n=scanner.nextDouble();
            duoCiTouZhi(P,i,n);
        }
        if(choose==7)
        { 

             System.out.println("月等额本息还款计算\n");
             System.out.println("------------------------------\n");
             System.out.print("请输入你所贷款金额：\n");
             double total=scanner.nextDouble();
             System.out.println("------------------------------\n");
             System.out.println("请输入你所贷款的年利率：\n");
             double i=scanner.nextDouble();
             System.out.println("------------------------------\n");
             System.out.println("请输入你贷款的还款时长（月）：\n");
             double m=scanner.nextDouble();
             daiKuan(total,i,m);

        }

    }
    private static void daiKuan(double total,double i,double m) {

        double n = m*12;
        double money = total*i*Math.pow((1.0+i),n)/(Math.pow(1.0+i,n)-1);
        System.out.println("你每月等额本息还款是："+money);  

    }
    private static void duoCiTouZhi(double P,double i,double n) {
        double total=P*Math.pow(1+i,n);
        System.out.println("------------------------------\n");
        System.out.println("你所获得的总金额是:"+total); 

    }
    private static void maiGuPiao(double P,double i,double total) {
        i=i*100;
        double n=(72/i);
        System.out.println("------------------------------\n");
        System.out.println("通过复利的股票型存款，得到期望金额大概所需要的年份：\n"+n); 

    }
    private static void bangZhaoTouZhi(double P,double n,double total) {
        double base= (double) (((total-P)/P)/n);
        System.out.println("通过复利的股票型存款本金翻倍的报酬率为："+base); 

    }
    private static void yangLaoJin(double i, double total,double n) {//n 时间       i 利率
        for(int j=1;j<=n;j++){
            i=(1+n)*i;
        }
        double money=total/i;
        System.out.println("需要本金："+money);
    }

    private static void danLi(double P, double i,double n) {
        double G; 

        G=P+P*i*n;
        System.out.println("单利终值为："+G);
    }

    private static void fuli(double N, double P, double i, double n) {
        for(int j=1;j<=n;j++){

            N=(1+i)*N;
        }
        double F;
        F=P*N;
        System.out.println("复利终值为："+F);
    }

}