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 public static int a=0; 8 9 static double A[] = new double[10]; 10 static double B[] = new double[10]; 11 static double C[] = new double[10]; 12 static double D[] = new double[10]; 13 14 //计算本金 15 public static void Benjin(){ 16 //int n; 17 //float f,i,p; 18 boolean flag; 19 Scanner scanner=new Scanner(System.in); 20 System.out.println("请输入终值: "); 21 f=scanner.nextDouble(); 22 System.out.println("请输入年利率: "); 23 i=scanner.nextDouble(); 24 System.out.println("请输入年数: "); 25 n=scanner.nextInt(); 26 if(n>=0) 27 { 28 if(i>=0&&i<=1) 29 { 30 flag=true; 31 p=(float) (f*1/Math.pow(1+i, n)); 32 } 33 else 34 { 35 System.out.println("输入的年利率有错！"); 36 flag=false; 37 38 } 39 } 40 else 41 { 42 System.out.println("输入的年数有错！"); 43 flag=false; 44 45 } 46 if(flag) 47 System.out.println("本金为： "+(double)(Math.round(p*100)/100.0)); 48 49 } 50 51 //计算本息和 52 public static void Benxihe(){ 53 double sum1=0,sum2=0; 54 boolean flag; 55 Scanner scanner=new Scanner(System.in); 56 System.out.println("请输入本金: "); 57 p=scanner.nextDouble(); 58 System.out.println("请输入年利率: "); 59 i=scanner.nextDouble(); 60 System.out.println("请输入年数: "); 61 n=scanner.nextInt(); 62 if(n>=0) 63 { 64 if(i>=0&&i<=1) 65 { 66 sum1=(float) (p*Math.pow(1+i, n)); 67 sum2=p*(1+i*n); 68 flag=true; 69 70 } 71 else 72 { 73 System.out.println("输入的年利率有错！"); 74 flag=false; 75 76 } 77 } 78 else 79 { 80 System.out.println("输入的年数有错！"); 81 flag=false; 82 83 } 84 if(flag) 85 { 86 System.out.println("复利的本息和为： "+(double)(Math.round(sum1*100)/100.0)); 87 System.out.println("单利的本息和为： "+(double)(Math.round(sum2*100)/100.0)); 88 } 89 } 90 91 //计算年数 92 public static void Nianshu(){ 93 boolean flag; 94 Scanner scanner=new Scanner(System.in); 95 System.out.println("请输入本金: "); 96 p=scanner.nextDouble(); 97 System.out.println("请输入终值: "); 98 f=scanner.nextDouble(); 99 System.out.println("请输入年利率: ");100 i=scanner.nextDouble();101 if(i>=0&&i<=1)102 {103 n=Logarithm.log(f/p,1+i); 104 flag=true;105 }106 else107 {108 System.out.println("输入的年利率有错！"); 109 flag=false;110 111 }112 if(flag)113 System.out.println("需要存的年数为: "+Math.ceil(n)); 114 }115 116 //计算年利率117 public static void Lilv(){118 boolean flag;119 Scanner scanner=new Scanner(System.in);120 System.out.println("请输入本金: ");121 p=scanner.nextDouble();122 System.out.println("请输入终值: ");123 f=scanner.nextDouble();124 System.out.println("请输入年数: ");125 n=scanner.nextInt();126 if(n>=0)127 {128 i=Math.pow(f/p, 1.0/n)-1;129 flag=true;130 }131 else132 {133 System.out.println("输入的年数有错！");134 flag=false;135 136 }137 if(flag)138 System.out.println("年报酬率为： "+(double)(Math.round(i*1000)/1000.0));139 }140 141 //计算本利之和连同年金投资后的总资产142 public static void Nianjin(){143 boolean flag;144 Scanner scanner=new Scanner(System.in);145 System.out.println("请输入每年定投资金: ");146 p=scanner.nextDouble(); 147 System.out.println("请输入年利率: ");148 i=scanner.nextDouble();149 System.out.println("请输入年数: ");150 n=scanner.nextInt();151 if(n>=0)152 {153 if(i>=0&&i<=1)154 {155 f=p*(1+i)*(Math.pow(1+i,n)-1)/i;156 flag=true;157 158 }159 else160 {161 System.out.println("输入的年利率有错！");162 flag=false;163 164 }165 }166 else167 {168 System.out.println("输入的年数有错！");169 flag=false;170 171 }172 if(flag)173 System.out.println("年资产总值为："+(double)(Math.round(f*100)/100.0)); 174 }175 176 //计算每月等额本息还款177 public static void BenxiHuankuan(){178 double f,i,p = 0;179 int n;180 boolean flag;181 Scanner scanner=new Scanner(System.in);182 System.out.println("请输入贷款金额: ");183 f=scanner.nextDouble();184 System.out.println("请输入年利率: ");185 i=scanner.nextDouble();186 System.out.println("请输入贷款年数: ");187 n=scanner.nextInt();188 if(n>=0)189 {190 if(i>=0&&i<=1)191 {192 i=i/12;193 n=n*12;194 p=f*i*Math.pow(1+i, n)/(Math.pow(1+i, n)-1);195 flag=true;196 197 }198 else199 {200 System.out.println("输入的年利率有错！");201 flag=false;202 203 }204 }205 else206 {207 System.out.println("输入的年数有错！");208 flag=false;209 210 }211 if(flag)212 System.out.println("每月等额本息还款为："+(double)(Math.round(p*10000)/10000.0));213 214 }215 216 public static void main(String[] args) {217 int choice;218 while(true){219 System.out.println("\t\t|***********************|");220 System.out.println("\t\t| 1. 求 本 金 \t|");221 System.out.println("\t\t| 2. 求 本 息 和 \t|");222 System.out.println("\t\t| 3. 求 年 数 \t|");223 System.out.println("\t\t| 4. 求 利 率 \t|");224 System.out.println("\t\t| 5. 求年资产总值\t|");225 System.out.println("\t\t| 6. 求等额本息还款\t|"); 226 System.out.println("\t\t| 7. 投 资 运 算 \t|");227 System.out.println("\t\t| 0. 退 出 \t|");228 System.out.println("\t\t|***********************|");229 Scanner scanner=new Scanner(System.in);230 System.out.println("\n请输入你的选择(0~7): ");231 choice=scanner.nextInt();232 switch(choice){233 case 1:234 Benjin();235 break;236 case 2:237 Benxihe();238 break;239 case 3:240 Nianshu();241 break;242 case 4:243 Lilv();244 break;245 case 5:246 Nianjin();247 break;248 case 6:249 BenxiHuankuan();250 break;251 case 7:252 TouziYunsuan();253 254 a++;255 break;256 case 0:257 System.out.println("Thanks for using!");258 System.exit(0);259 break;260 261 262 default:263 {264 System.out.println("输入有误!");265 break;266 }267 }268 } 269 }270 271 private static void TouziYunsuan() {272 boolean flag;273 int number;274 Scanner scanner=new Scanner(System.in);275 System.out.println("请输入本金: ");276 p=scanner.nextDouble();277 System.out.println("请输入年利率: ");278 i=scanner.nextDouble();279 System.out.println("请输入年限: ");280 n = scanner.nextInt();281 for (int t = 1; t <= n; t++) {282 f = p * (1 + i * t);283 284 System.out.println("第" + t + "年\t " + (double)(Math.round(f*100)/100.0) + "");285 }286 A[a]=p;287 B[a]=i;288 C[a]=n;289 D[a]=f;290 291 System.out.println("是否查看之前记录(1为是): ");292 number = scanner.nextInt();293 if(number==1){294 System.out.print("\t"+"本金"+"\t"+"年利率"+"\t"+"年限"+"\t"+"终值"+"\n");295 for(int b=0;b<=a;b++)296 {297 System.out.print(b+1+"\t"+A[b]+"\t"+B[b]+"\t"+C[b]+"\t"+D[b]+"\n");298 299 }300 301 }302 else{303 System.out.print("谢谢");304 305 } 306 }307 } 
