复利计算器4.0 【java版】

import java.util.Scanner;

public class FuLi {

    public static void main(String[] args) {
        double N=;
        Scanner scanner=new Scanner(System.in);
        System.out.println("请选择复利计算(1)单利计算(2)复利计算(3)养老金计算方法(4)股票计算(5)帮你找投资(6)多次投资(7)贷款");
        int choose=scanner.nextInt();

        if(choose==){
            System.out.println("(1)单利计算");
            System.out.println("------------------------------");
            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==){
            System.out.println("(2)复利计算");
            System.out.println("------------------------------");
            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==){
            System.out.println("(3)养老金计算方法");
            System.out.println("------------------------------");
            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==){
            System.out.println("(4)股票计算");
            System.out.println("------------------------------");
            System.out.println("请输入你所存入的本金：");
            double P=scanner.nextDouble();
            System.out.println("------------------------------");
            System.out.println("请输入你所存的报酬率：");
            double i=scanner.nextDouble();
            System.out.println("------------------------------");
            System.out.println(" 到最后期望的金额：");
            double total=scanner.nextDouble();
            maiGuPiao(P,i,total);
        }
        if(choose==)
        {
            System.out.println("(5)帮你找投资");
            System.out.println("------------------------------");
            System.out.println("请输入你所存入的本金：");
            double P=scanner.nextDouble();
            System.out.println("------------------------------");
            System.out.println(" 请输入你所存的存款时长：");
            double n=scanner.nextDouble();
            System.out.println("------------------------------");
            System.out.println(" 到最后期望的金额：");
            double total=scanner.nextDouble();
            bangZhaoTouZhi(P,n,total);
        }
        if(choose==)
        {
            System.out.println("(6)多次投资");
            System.out.println("------------------------------");
            System.out.println("请输入你所存入的本金：");
            double P=scanner.nextDouble();
            System.out.println("------------------------------");
            System.out.println("请输入你所存的报酬率：");
            double i=scanner.nextDouble();
            System.out.println("------------------------------");
            System.out.println("请输入你所存的存款时长：");
            double n=scanner.nextDouble();
            duoCiTouZhi(P,i,n);
        }
        if(choose==)
        { 

             System.out.println("(7)贷款");
             System.out.println("------------------------------");
             System.out.print("请输入你所贷款金额：");
             double total=scanner.nextDouble();
             System.out.println("------------------------------");
             System.out.println("请输入你所贷款的年利率：");
             double i=scanner.nextDouble();
             System.out.println("------------------------------");
             System.out.println("请输入你贷款的还款时长（月）：");
             double m=scanner.nextDouble();
             daiKuan(total,i,m);

        }

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

        double n = m*;
        double money = total*i*Math.pow((1.0+i),n)/(Math.pow(1.0+i,n)-);
        System.out.println("------------------------------");
        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(+i,n);
        System.out.println("------------------------------");
        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*;
        double n=(/i);
        System.out.println("------------------------------");
        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); 

    }
    private static void bangZhaoTouZhi(double P,double n,double total) {
        double base= (double) (((total-P)/P)/n);
        System.out.println("------------------------------");
        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=;j<=n;j++){
            i=(+n)*i;
        }
        double money=total/i;
        System.out.println("------------------------------");
        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("------------------------------");
        System.out.println("单利终值为："+G);
    }

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

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

}