1 package kxj;
2 import java.util.Scanner;
3
4 public class Fulijisuan {
5 public static double p,i,f ;
6 public static double n;
7
8 //计算本金
9 public static void Benjin(){
10 //int n;
11 //float f,i,p;
12 boolean flag;
13 Scanner scanner=new Scanner(System.in);
14 System.out.println("请输入终值: ");
15 f=scanner.nextDouble();
16 System.out.println("请输入年利率: ");
17 i=scanner.nextDouble();
18 System.out.println("请输入年数: ");
19 n=scanner.nextInt();
20 if(n>=0)
21 {
22 if(i>=0&&i<=1)
23 {
24 flag=true;
25 p=(float) (f*1/Math.pow(1+i, n));
26 }
27 else
28 {
29 System.out.println("输入的年利率有错！");
30 flag=false;
31
32 }
33 }
34 else
35 {
36 System.out.println("输入的年数有错！");
37 flag=false;
38
39 }
40 if(flag)
41 System.out.println("本金为： "+(double)(Math.round(p*100)/100.0));
42
43 }
44
45 //计算本息和
46 public static void Benxihe(){
47 double sum1=0,sum2=0;
48 boolean flag;
49 Scanner scanner=new Scanner(System.in);
50 System.out.println("请输入本金: ");
51 p=scanner.nextDouble();
52 System.out.println("请输入年利率: ");
53 i=scanner.nextDouble();
54 System.out.println("请输入年数: ");
55 n=scanner.nextInt();
56 if(n>=0)
57 {
58 if(i>=0&&i<=1)
59 {
60 sum1=(float) (p*Math.pow(1+i, n));
61 sum2=p*(1+i*n);
62 flag=true;
63
64 }
65 else
66 {
67 System.out.println("输入的年利率有错！");
68 flag=false;
69
70 }
71 }
72 else
73 {
74 System.out.println("输入的年数有错！");
75 flag=false;
76
77 }
78 if(flag)
79 {
80 System.out.println("复利的本息和为： "+(double)(Math.round(sum1*100)/100.0));
81 System.out.println("单利的本息和为： "+(double)(Math.round(sum2*100)/100.0));
82 }
83 }
84
85 //计算年数
86 public static void Nianshu(){
87 boolean flag;
88 Scanner scanner=new Scanner(System.in);
89 System.out.println("请输入本金: ");
90 p=scanner.nextDouble();
91 System.out.println("请输入终值: ");
92 f=scanner.nextDouble();
93 System.out.println("请输入年利率: ");
94 i=scanner.nextDouble();
95 if(i>=0&&i<=1)
96 {
97 n=Logarithm.log(f/p,1+i);
98 flag=true;
99 }
100 else
101 {
102 System.out.println("输入的年利率有错！");
103 flag=false;
104
105 }
106 if(flag)
107 System.out.println("需要存的年数为: "+Math.ceil(n));
108 }
109
110 //计算年利率
111 public static void Lilv(){
112 boolean flag;
113 Scanner scanner=new Scanner(System.in);
114 System.out.println("请输入本金: ");
115 p=scanner.nextDouble();
116 System.out.println("请输入终值: ");
117 f=scanner.nextDouble();
118 System.out.println("请输入年数: ");
119 n=scanner.nextInt();
120 if(n>=0)
121 {
122 i=Math.pow(f/p, 1.0/n)-1;
123 flag=true;
124 }
125 else
126 {
127 System.out.println("输入的年数有错！");
128 flag=false;
129
130 }
131 if(flag)
132 System.out.println("年报酬率为： "+(double)(Math.round(i*1000)/1000.0));
133 }
134
135 //计算本利之和连同年金投资后的总资产
136 public static void Nianjin(){
137 boolean flag;
138 Scanner scanner=new Scanner(System.in);
139 System.out.println("请输入每年定投资金: ");
140 p=scanner.nextDouble();
141 System.out.println("请输入年利率: ");
142 i=scanner.nextDouble();
143 System.out.println("请输入年数: ");
144 n=scanner.nextInt();
145 if(n>=0)
146 {
147 if(i>=0&&i<=1)
148 {
149 f=p*(1+i)*(Math.pow(1+i,n)-1)/i;
150 flag=true;
151
152 }
153 else
154 {
155 System.out.println("输入的年利率有错！");
156 flag=false;
157
158 }
159 }
160 else
161 {
162 System.out.println("输入的年数有错！");
163 flag=false;
164
165 }
166 if(flag)
167 System.out.println("年资产总值为："+(double)(Math.round(f*100)/100.0));
168 }
169
170 //计算每月等额本息还款
171 public static void BenxiHuankuan(){
172 double f,i,p = 0;
173 int n;
174 boolean flag;
175 Scanner scanner=new Scanner(System.in);
176 System.out.println("请输入贷款金额: ");
177 f=scanner.nextDouble();
178 System.out.println("请输入年利率: ");
179 i=scanner.nextDouble();
180 System.out.println("请输入贷款年数: ");
181 n=scanner.nextInt();
182 if(n>=0)
183 {
184 if(i>=0&&i<=1)
185 {
186 i=i/12;
187 n=n*12;
188 p=f*i*Math.pow(1+i, n)/(Math.pow(1+i, n)-1);
189 flag=true;
190
191 }
192 else
193 {
194 System.out.println("输入的年利率有错！");
195 flag=false;
196
197 }
198 }
199 else
200 {
201 System.out.println("输入的年数有错！");
202 flag=false;
203
204 }
205 if(flag)
206 System.out.println("每月等额本息还款为："+(double)(Math.round(p*10000)/10000.0));
207
208 }
209
210 public static void main(String[] args) {
211 int choice;
212 while(true){
213 System.out.println("\t\t|***********************|");
214 System.out.println("\t\t| 1. 求 本 金 \t|");
215 System.out.println("\t\t| 2. 求 本 息 和 \t|");
216 System.out.println("\t\t| 3. 求 年 数 \t|");
217 System.out.println("\t\t| 4. 求 利 率 \t|");
218 System.out.println("\t\t| 5. 求年资产总值\t|");
219 System.out.println("\t\t| 6. 求等额本息还款\t|");
220 System.out.println("\t\t| 7. 退 出 \t|");
221 System.out.println("\t\t|***********************|");
222 Scanner scanner=new Scanner(System.in);
223 System.out.println("\n请输入你的选择(1~7): ");
224 choice=scanner.nextInt();
225 switch(choice){
226 case 1:
227 Benjin();
228 break;
229 case 2:
230 Benxihe();
231 break;
232 case 3:
233 Nianshu();
234 break;
235 case 4:
236 Lilv();
237 break;
238 case 5:
239 Nianjin();
240 break;
241 case 6:
242 BenxiHuankuan();
243 break;
244 case 7:
245 System.out.println("Thanks for using!");
246 System.exit(0);
247 break;
248 default:
249 {
250 System.out.println("输入有误!");
251 break;
252 }
253 }
254 }
255 }
256 }
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