复利计算2.0

 1 import java.util.Scanner;
 2 
 3 public class fuli {
 4 
 5     /**
 6      * @param args
 7      */
 8     public static void main(String[] args) {
 9         // TODO Auto-generated method stub
10         Scanner caculate = new Scanner(System.in);
11         int a = 0;
12         while (a == 0 || a == 1 || a == 2 || a == 3) {
13             System.out.println("请选择1/2/3：\n1.复利计算终值2.复利计算本金3.单利计算本息");
14             int a1 = caculate.nextInt();
15             if (a1 == 1) {
16                 fuli.CFutureValue();
17                 break;
18             } else if (a1 == 2) {
19                 fuli.CPresentValue();
20                 break;
21             }
22 
23             else if (a1 == 3) {
24                 fuli.PrincipalAndInterest();
25                 break;
26             } else {
27                 System.out.println("\n您的输入错误");
28                 a1 = a;
29             }
30         }
31     }
32 
33     // 复利计算终值
34     static void CFutureValue() {
35         Scanner fuli = new Scanner(System.in);
36         System.out.println("请输入本金：");
37         double PresentValue = fuli.nextDouble(); // 本金
38         System.out.println("请输入存款年数：");
39         int year = fuli.nextInt(); // 存钱年数
40         System.out.println("请输入利率：");
41         double r = fuli.nextDouble(); // 利率
42         double sum = 1;
43         for (int i = 1; i <= year; i++) {
44             sum = (1 + r) * sum;
45         }
46         System.out.println("总额为：" + sum * PresentValue);
47     }
48 
49     // 复利计算本金
50     static void CPresentValue() {
51 
52         Scanner fuli = new Scanner(System.in);
53         System.out.println("请输入终值：");
54         double sum = fuli.nextDouble(); // 终值
55         System.out.println("请输入存款年数：");
56         int year = fuli.nextInt(); // 存钱年数
57         System.out.println("请输入利率：");
58         double r = fuli.nextDouble(); // 利率
59         double PresentValue = 1;
60         for (int i = 1; i <= year; i++) {
61             PresentValue = (1 + r) * PresentValue;
62         }
63         System.out.println("总额为：" + sum * (1 / PresentValue));
64     }
65 
66     // 单利计算本息
67     static void PrincipalAndInterest() {
68         Scanner danli = new Scanner(System.in);
69         System.out.println("请输入本金：");
70         double PresentValue = danli.nextDouble(); // 本金
71         System.out.println("请输入存款年数：");
72         int Annuity = danli.nextInt(); // 存钱年数
73         System.out.println("请输入利率：");
74         double r = danli.nextDouble(); // 利率
75         double sum1 = 1;
76         sum1 = (1 + r * Annuity) * PresentValue;
77         System.out.println("本息为：" + sum1);
78     }
79 
80 }