0318-复利计算3

Posted 2020-06-25

import java.text.DecimalFormat;
import java.util.Scanner;

public class Fulijisuan {
    public static void main(String[] args) {
                  // TODO Auto-generated method stub
        System.out.println("欢迎使用复利计算器！");
        /*复利计算公式：F=P*(1+r)^N
         * F:复利终值
         * P:本金
         * r:利率
         * N:利率获取时间的整数倍
         */
        Scanner scanner=new Scanner(System.in);
        System.out.print("复利计算器：计算单利和复利请按1,计算本金请按2,股票请按3,报酬率请按4,资产总值请按5,每月等额本息还款请按6:");
        int num=scanner.nextInt();
         DecimalFormat df1 = new DecimalFormat("#.00");
        if(num==1){
            double F;
            System.out.print("请输入本金P：");     
            double P = scanner.nextDouble();  
            System.out.print("请输入存入年数N：");
            int N = scanner.nextInt();           
            System.out.print("请输入利率r：");
            double r = scanner.nextDouble();
            F=P+P*N*r;
            System.out.println("单利终值为F："+df1.format(F));
            F=0;
            System.out.print("请输入复利次数：");
            double m = scanner.nextDouble();
             F=P*(Math.pow((1+r/m), N*m));
                 System.out.println("复利终值为F："+df1.format(F));

        }
        if(num==2){
             double H=1,P;
              System.out.print("请输入复利终值F：");     
              double F = scanner.nextDouble();  
              System.out.print("请输入存入年数N：");
              int N = scanner.nextInt();           
             System.out.print("请输入利率r：");
              double r = scanner.nextDouble();
                 P=F/Math.pow(1+r, N);
                 System.out.println("本金应为P："+df1.format(P));
        }
        if(num==3){
            double N = 1;
            System.out.print("请输入本金P：");     
            double P= scanner.nextDouble();  
            System.out.print("请输入终值F：");
            double F= scanner.nextDouble();           
            System.out.print("请输入报酬率r：");
            double r = scanner.nextDouble();
                N=(int)((Math.log(F)/Math.log(1+r))-(Math.log(P)/Math.log(1+r)));
            System.out.println("存入时间为N："+N);
        }
        if(num==4){
            double r= 1;
            System.out.print("请输入本金P：");     
            double P= scanner.nextDouble();  
            System.out.print("请输入终值F：");
            double F= scanner.nextDouble();           
            System.out.print("请输入存入年数N：");
            int N = scanner.nextInt();
                r=Math.pow(F/P,1d/N);
            System.out.println("报酬率应为r："+df1.format(r));
        }
        if(num==5){
            System.out.println("年投入请按51,月投入请按52:");
            int number=scanner.nextInt();
            if(number==51){
                double F= 1;
                System.out.print("请输入年本金P：");     
                double P= scanner.nextDouble();  
                System.out.print("请输入利率r：");
                Double r= scanner.nextDouble();           
                System.out.print("请输入存入年数N：");
                int N = scanner.nextInt();
                    F=P*(Math.pow((1+r), N)-1)/r;
                System.out.println("按年投资的终值为F："+df1.format(F));
                }
            if(number==52){
                System.out.print("请输入月本金P：");     
                double P= scanner.nextDouble();  
                System.out.print("请输入利率r：");
                Double r= scanner.nextDouble();           
                System.out.print("请输入存入年数N：");
                int N = scanner.nextInt();
                double F=P*(Math.pow(1+r/12.0, N*12)-1)/(r/12);
                System.out.println("按月投资的终值为F："+df1.format(F));
                }
            }
            
                            
        if(num==6){
            double p1=1,F=1;
            System.out.print("请输入借款金额P：");     
            double P= scanner.nextDouble();  
            System.out.print("请输入年利率r：");
            Double r= scanner.nextDouble();           
            System.out.print("请输入还款期限N：");
            int N = scanner.nextInt();
            for(int i=1;i<=N;i++){
                F=P+(P*r)*N;
            }
            p1=F/12;
            System.out.println("每月等额本息还款为："+df1.format(p1));
            
        }
    }
}