軟體工程--複利計算1.0，2.0---代碼及運作結果截圖

代碼如下：

1 import java.util.Scanner;
  2 
  3 
  4 public class compoundung {
  5 
  6 /**
  7 * @param args
  8 */
  9 public static void main(String[] args) {
 10 // TODO Auto-generated method stub
 11 int P = 0;
 12 double i=0;
 13 int n=0;
 14 int F=0;
 15 Scanner in = new Scanner(System.in);
 16 System.out.println("1.複利計算");
 17 System.out.println("2.單利計算");
 18 System.out.println("3.本金計算");
 19 System.out.println("4.求期限");
 20 System.out.print("請選擇：");
 21 int select = in.nextInt();
 22 if(select>4||select<1){
 23 System.out.println("選擇有誤！");
 24 System.out.print("請重新選擇：");
 25 select = in.nextInt();
 26 }
 27 //單、複利的輸入
 28 if(select==2||select==1){
 29 System.out.print("輸入本金:");
 30 P = in.nextInt();
 31 System.out.print("輸入利率:");
 32 i = in.nextDouble();
 33 System.out.print("輸入期數:");
 34 n = in.nextInt();
 35 }
 36 else if(select==3){
 37 //求本金的輸入
 38 System.out.print("輸入終值:");
 39 F = in.nextInt();
 40 System.out.print("輸入利率:");
 41 i = in.nextDouble();
 42 System.out.print("輸入期數:");
 43 n = in.nextInt();
 44 }
 45 else{
 46 System.out.print("輸入本金:");
 47 P = in.nextInt();
 48 System.out.print("輸入利率:");
 49 i = in.nextDouble();
 50 System.out.print("輸入終值:");
 51 F = in.nextInt();
 52 }
 53 
 54 
 55 jiXuan jx = new jiXuan();
 56 //複利處理
 57 if(select==1){
 58 System.out.print("輸入年複利次數:");
 59 int m = in.nextInt();
 60 jx.fuLi(P, i, n, m);
 61 }
 62 //單利處理
 63 else if(select==2){
 64 jx.danLi(P, i, n);    
 65 }
 66 else if(select==3){
 67 jx.benJi(F, i, n);
 68 }
 69 else if(select==4){
 70 jx.time(F, i, P);
 71 
 72 }
 73 }    
 74 }
 75 
 76  
 77 
 78 import java.text.DecimalFormat;
 79 
 80 public class jiXuan {
 81 public void fuLi(int P,double i,int n,int m){
 82 DecimalFormat df=new DecimalFormat("#.000");
 83 double F = P*(Math.pow((1+i/m),n*m));
 84 System.out.println("複利終值:"+df.format(F));
 85 
 86 }
 87 public void danLi(int P,double i,int n){
 88 DecimalFormat df=new DecimalFormat("#.000");
 89 double F =P*(1+i*n) ;
 90 System.out.println("單利終值:"+df.format(F));
 91 
 92 }
 93 public void benJi(int F,double i,int n){
 94 double P= F / (1 + i * n);
 95 System.out.println("本金為:"+P);
 96 }
 97 public void time(int F,double i,double P){
 98 DecimalFormat df=new DecimalFormat("#.000");
 99 double n = ((F/P)-1)/i;
100 System.out.println("期限為:"+df.format(n));
101 }
102 }