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import  java.util.Scanner;
 
public  class  A02 {
 
     public  static  void  main(String[] args) {
         // TODO Auto-generated method stub
         Scanner input =  new  Scanner (System.in);
         String A= "y" ;
         do {
         System.out.println( "*************购 物 管 理 系 统************" );
         System.out.println( "\t\t1.注册" );
         System.out.println( "\t\t2.登录" );
         System.out.println( "\t\t3.抽奖" );
         System.out.println( "*****************************************" );
         System.out.println( "\n请选择菜单:" );
         int  choice= input.nextInt();
         String show= "" ;
         switch  (choice) {
         case  1 :
             show= "执行注册" ;
             break ;
         case  2 :
             show= "执行登录" ;
             break ;
         case  3 :
             show= "执行抽奖" ;
             break ;
         default :
             show= "输入有误" ;
             break ;
         }
         System.out.println(show);
         System.out.print( "是否继续(y / n):" );
         A=input.next();
     } while (A.equals( "y" ));
         System.out.println( "系统退出" );
     }
     }