看到有人問如圖的程序，就去寫了幾行代碼，順便復習一下條件語句和ASCII碼

 1 import java.util.Scanner;
 2 public class test1 {
 3 
 4     public static void main(String[] args) 
 5     {
 6         Scanner sc = new Scanner(System.in);
 7         System.out.print("輸入一個ASCII數值：");
 8         int ascii = sc.nextInt();
 9         sc.close();
 
10         char ch = (char)ascii;
11         //在‘a’~‘z’轉成‘A’~‘Z’
12         if(ch >= ‘a‘ && ch <= ‘z‘)
13         {
14             System.out.println((char)(ch-32));
15         }
16         //在‘A’~‘Z’轉成‘a’~‘z’
 

17         else if(ch >= ‘A‘ && ch <= ‘Z‘)
18         {
19             System.out.println((char)(ch+32));
20         }
21         //在‘0’~‘9’輸出0~9
22         else if(ch >= ‘0‘ && ch <= ‘9‘)
23         {
24             System.out.println(ch);
25         }
 
26         //輸出“+ - * /”
27         else if(ch == ‘+‘ || ch== ‘-‘ || ch == ‘*‘ || ch == ‘/‘)
28         {
29             System.out.println("屬於算術運算符");
30         }
31         //輸出“非法字符”
32         else
33         {
34             System.out.println("非法字符");
35         }
36     }
37 }

作者：耑新新，發布於 博客園

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Java小實驗之數據轉換