第一題:

程式碼如下:

 1 package com.kk;
 2 import java.util.Scanner;
 3 public class Lx002 {
 4     public static void main(String[]agrs) {
 5         int num=0;
 6         
 7         Scanner sc=new Scanner(System.in);
 8         System.out.println("輸入一個四位數：");
 9         num=sc.nextInt();
10         
11
 
         int qianwei=num/1000%10;    
12         int baiwei=num/100%10;
13         int shiwei=num/10%10;
14         int gewei=num%10;
15         int add=qianwei+baiwei+shiwei+gewei;
16         System.out.println("千位是"+qianwei);
17         System.out.println("百位是"+baiwei);
18         System.out.println("十位是"+shiwei);
 
19         System.out.println("個位是"+gewei);
20         System.out.println("五位數之和是"+add);
21         System.out.println(add>20?"中獎":"未中獎");
22         
23     }
24 }

結果如下: