1 import java.util.Scanner;
2
3 public class text {
4
5 public static void main(String[] args) {
6 while (true) {
7 Scanner scanner = new Scanner(System.in);
8 System.out.println("----------------------------");
9 System.out.println(" 1.複利計算本息 ");
10 System.out.println(" 2.單利計算本息 ");
11 System.out.println(" 3.複利計算本金 ");
12 System.out.println(" 4.單利計算本金 ");
13 System.out.println(" 5.算投資年限 ");
14 System.out.println(" 6.算投資年利率 ");
15 System.out.println(" 7.每年定投收益 ");
16 System.out.println(" 8.每月定投收益 ");
17 System.out.println(" 9.每月等額本息還款 ");
18 System.out.println(" 0.退出 ");
19 System.out.println("----------------------------");
20 System.out.print("請選擇：");
21 int number = scanner.nextInt();
22 switch (number) {
23 case 1:
24 BenxiFuli();
25 break;
26 case 2:
27 BenxiDanli();
28 break;
29 case 3:
30 BenjinFuli();
31 break;
32 case 4:
33 BenjinDanli();
34 break;
35 case 5:
36 TouziYear();
37 break;
38 case 6:
39 TouziRate();
40 break;
41 case 7:
42 YearDingtoushouyi();
43 break;
44 case 8:
45 MonthDingtoushouyi();
46 break;
47 case 9:
48 Dengerbenxihuanknan();
49 break;
50 case 0:
51 Exit();
52 break;
53 default: {
54 System.out.println("輸入錯誤!請重新輸入!");
55 break;
56 }
57 }
58 }
59
60 }
61
62 private static void Exit() {
63 // TODO 自動生成的方法存根
64 System.out.println("謝謝使用！");
65 System.exit(0);
66
67 }
68
69 private static void Dengerbenxihuanknan() {
70 // TODO 自動生成的方法存根
71 Scanner scanner = new Scanner(System.in);
72 System.out.print("請輸入貸款本金：");
73 double money = scanner.nextDouble();
74 System.out.print("請輸入年利率：");
75 double rate = scanner.nextDouble();
76 System.out.print("請輸入年限：");
77 int year = scanner.nextInt();
78 double num = 1;
79 for (int i = 1; i <= year * 12; i++) {
80 num = (1 + (rate / 12)) * num;
81
82 }
83 money = money * ((rate / 12) * num) / (num - 1);
84 System.out.println("每月等額本息還款："
85 + (double) (Math.round(money * 100) / 100.0));
86
87 }
88
89 private static void MonthDingtoushouyi() {
90 // TODO 自動生成的方法存根
91 Scanner scanner = new Scanner(System.in);
92
93 System.out.print("請輸入每月的定投金額：");
94 double money = scanner.nextDouble();
95 System.out.print("請輸入年利率：");
96 double rate = scanner.nextDouble();
97 System.out.print("請輸入年限：");
98 int year = scanner.nextInt();
99 double num = 1;
100 for (int i = 1; i <= year * 12; i++) {
101 num = (1 + (rate / 12)) * num;
102
103 }
104 money = money * (1 + (rate / 12)) * (-1 + num) / (rate / 12);
105 System.out.println("定投" + year + "年後的資産總值為："
106 + (double) (Math.round(money * 100) / 100.0));
107
108 }
109
110 private static void YearDingtoushouyi() {
111 // TODO 自動生成的方法存根
112 Scanner scanner = new Scanner(System.in);
113
114 System.out.print("請輸入每年的投資金額：");
115 double money = scanner.nextDouble();
116 System.out.print("請輸入年利率：");
117 double rate = scanner.nextDouble();
118 System.out.print("請輸入年限：");
119 int year = scanner.nextInt();
120 double num = 1;
121 for (int i = 1; i <= year; i++) {
122 num = (1 + rate) * num;
123
124 }
125 money = money * (1 + rate) * (-1 + num) / rate;
126 System.out.println("定投" + year + "年後的資産總值為："
127 + (double) (Math.round(money * 100) / 100.0));
128
129 }
130
131 private static void TouziRate() {
132 // TODO 自動生成的方法存根
133 Scanner scanner = new Scanner(System.in);
134 System.out.print("請輸入投資金額：");
135 double money1 = scanner.nextDouble();
136 System.out.print("請輸入收獲金額：");
137 double money2 = scanner.nextDouble();
138
139 System.out.print("請輸入年限：");
140 int year = scanner.nextInt();
141 double rate;
142 rate = Math.pow(money2 / money1, 1.0 / year) - 1;
143 System.out.println("所需年利率為："
144 + (double) (Math.round(rate * 10000) / 10000.0));
145
146 }
147
148 private static void TouziYear() {
149 // TODO 自動生成的方法存根
150 Scanner scanner = new Scanner(System.in);
151 System.out.print("請輸入投資金額：");
152 double money1 = scanner.nextDouble();
153 System.out.print("請輸入收獲金額：");
154 double money2 = scanner.nextDouble();
155
156 System.out.print("請輸入年利率：");
157 double rate = scanner.nextDouble();
158 double year;
159 year = Logarithm.log(money2 / money1, 1 + rate);
160 year = Math.ceil(year);
161 System.out.println("需要存入的年限為：" + year);
162
163 }
164
165 private static void BenjinDanli() {
166 // TODO 自動生成的方法存根
167 Scanner scanner = new Scanner(System.in);
168 System.out.print("請輸入本息：");
169 double money = scanner.nextDouble();
170 System.out.print("請輸入年利率：");
171 double rate = scanner.nextDouble();
172 System.out.print("請輸入年限：");
173 int year = scanner.nextInt();
174 money = money * (1 / (1 + rate * year));
175 System.out.println("單利計算需要存入的本金為："
176 + (double) (Math.round(money * 100) / 100.0));
177
178 }
179
180 private static void BenjinFuli() {
181 // TODO 自動生成的方法存根
182 Scanner scanner = new Scanner(System.in);
183 System.out.print("請輸入本息：");
184 double money = scanner.nextDouble();
185 System.out.print("請輸入年利率：");
186 double rate = scanner.nextDouble();
187 System.out.print("請輸入年限：");
188 int year = scanner.nextInt();
189 double num = 1;
190 for (int i = 1; i <= year; i++) {
191 num = num * (1 + rate);
192 }
193 money = money * (1 / num);
194 System.out.println("複利計算需要存入的本金為："
195 + (double) (Math.round(money * 100) / 100.0));
196
197 }
198
199 private static void BenxiDanli() {
200 // TODO 自動生成的方法存根
201 Scanner scanner = new Scanner(System.in);
202 System.out.print("請輸入本金：");
203 double money = scanner.nextDouble();
204 System.out.print("請輸入年利率：");
205 double rate = scanner.nextDouble();
206 System.out.print("請輸入年限：");
207 int year = scanner.nextInt();
208 money = money + money * rate * year;
209 System.out.println("存入" + year + "年後的單利計算本息為："
210 + (double) (Math.round(money * 100) / 100.0));
211
212 }
213
214 private static void BenxiFuli() {
215 // TODO 自動生成的方法存根
216 Scanner scanner = new Scanner(System.in);
217 System.out.print("請輸入本金：");
218 double money = scanner.nextDouble();
219 System.out.print("請輸入年利率：");
220 double rate = scanner.nextDouble();
221 System.out.print("請輸入年限：");
222 int year = scanner.nextInt();
223 for (int i = 1; i <= year; i++) {
224 money = (1 + rate) * money;
225 }
226 System.out.println("存入" + year + "年後的複利計算本息為："
227 + (double) (Math.round(money * 100) / 100.0));
228
229 }
230 }
