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 Scanner scanner=new Scanner(System.in); 13 System.out.println("请输入终值: "); 14 f=scanner.nextDouble(); 15 System.out.println("请输入年利率: "); 16 i=scanner.nextDouble(); 17 System.out.println("请输入年数: "); 18 n=scanner.nextInt(); 19 p=(float) (f*1/Math.pow(1+i, n)); 20 System.out.println("本金为： "+(double)(Math.round(p*100)/100.0)); 21 22 } 23 24 //计算本息和 25 public static void Benxihe(){ 26 double sum1,sum2; 27 Scanner scanner=new Scanner(System.in); 28 System.out.println("请输入本金: "); 29 p=scanner.nextDouble(); 30 System.out.println("请输入年利率: "); 31 i=scanner.nextDouble(); 32 System.out.println("请输入年数: "); 33 n=scanner.nextInt(); 34 sum1=(float) (p*Math.pow(1+i, n)); 35 sum2=p*(1+i*n); 36 System.out.println("复利的本息和为： "+(double)(Math.round(sum1*100)/100.0)); 37 System.out.println("单利的本息和为： "+(double)(Math.round(sum2*100)/100.0)); 38 } 39 40 //计算年数 41 public static void Nianshu(){ 42 Scanner scanner=new Scanner(System.in); 43 System.out.println("请输入本金: "); 44 p=scanner.nextDouble(); 45 System.out.println("请输入终值: "); 46 f=scanner.nextDouble(); 47 System.out.println("请输入年利率: "); 48 i=scanner.nextDouble(); 49 n=Logarithm.log(f/p,1+i); 50 //n=Math.ceil(n); 51 System.out.println("需要存的年数为: "+Math.ceil(n)); 52 } 53 54 //计算年利率 55 public static void Lilv(){ 56 Scanner scanner=new Scanner(System.in); 57 System.out.println("请输入本金: "); 58 p=scanner.nextDouble(); 59 System.out.println("请输入终值: "); 60 f=scanner.nextDouble(); 61 System.out.println("请输入年数: "); 62 n=scanner.nextInt(); 63 i=Math.pow(f/p, 1.0/n)-1; 64 System.out.println("年报酬率为： "+(double)(Math.round(i*1000)/1000.0)); 65 } 66 67 //计算本利之和连同年金投资后的总资产 68 public static void Nianjin(){ 69 Scanner scanner=new Scanner(System.in); 70 System.out.println("请输入每年定投资金: "); 71 p=scanner.nextDouble(); 72 System.out.println("请输入年利率: "); 73 i=scanner.nextDouble(); 74 System.out.println("请输入年数: "); 75 n=scanner.nextInt(); 76 f=p*(1+i)*(Math.pow(1+i,n)-1)/i; 77 System.out.println("年资产总值为："+(double)(Math.round(f*100)/100.0)); 78 } 79 80 //计算每月等额本息还款 81 public static void BenxiHuankuan(){ 82 double f,i,p; 83 int n; 84 Scanner scanner=new Scanner(System.in); 85 System.out.println("请输入贷款金额: "); 86 f=scanner.nextDouble(); 87 System.out.println("请输入年利率: "); 88 i=scanner.nextDouble(); 89 System.out.println("请输入贷款年数: "); 90 n=scanner.nextInt(); 91 i=i/12; 92 n=n*12; 93 p=f*i*Math.pow(1+i, n)/(Math.pow(1+i, n)-1); 94 System.out.println("每月等额本息还款为："+(double)(Math.round(p*10000)/10000.0)); 95 96 } 97 98 public static void main(String[] args) { 99 int choice; 100 while(true){ 101 System.out.println(" |***********************|"); 102 System.out.println(" | 1. 求 本 金 |"); 103 System.out.println(" | 2. 求 本 息 和 |"); 104 System.out.println(" | 3. 求 年 数 |"); 105 System.out.println(" | 4. 求 利 率 |"); 106 System.out.println(" | 5. 求年资产总值 |"); 107 System.out.println(" | 6. 求等额本息还款 |"); 108 System.out.println(" | 7. 退 出 |"); 109 System.out.println(" |***********************|"); 110 Scanner scanner=new Scanner(System.in); 111 System.out.println(" 请输入你的选择(1~7): "); 112 choice=scanner.nextInt(); 113 switch(choice){ 114 case 1: 115 Benjin(); 116 break; 117 case 2: 118 Benxihe(); 119 break; 120 case 3: 121 Nianshu(); 122 break; 123 case 4: 124 Lilv(); 125 break; 126 case 5: 127 Nianjin(); 128 break; 129 case 6: 130 BenxiHuankuan(); 131 break; 132 case 7: 133 System.out.println("Thanks for using!"); 134 System.exit(0); 135 break; 136 default: 137 { 138 System.out.println("输入有误!"); 139 break; 140 } 141 } 142 } 143 } 144 }
功能：增加了复利条件下等额本息还款的功能。
