要求：

　　輸入：begin和end

　　輸出：依次打印出begin到end

 1 import java.util.Scanner;
 2 //遞歸打印begin —— end
 3 public class demo1 {
 4 
 5     public static void f(int begin,int end){
 6         if(end-1>=begin){
 7             f(begin,end-1);
 8         }
 9         System.out.print (end+" ");
10     }
11     public
 
 static void main(String[] args) {
12         Scanner sc = new Scanner(System.in);
13         int begin = sc.nextInt();
14         int end = sc.nextInt();
15         f(begin,end);
16     }
17 
18 }

打印begin~end