while (true)  

{       

               int x, y, m;                                                                         //定义三个int类型的变量

               Random r = new Random();    

                x = r.Next(0,  3);                                                               //   0为石头， 1为布， 2为剪刀

                y = r.Next(0,  3);        

                m = x - y;           

                 Console.Write("张三="+x+"\t李四="+y);          

               if( m == -2||m == 1  )      

       {            

                Console.Write("\t那就是张三赢");      

       }       

      else if (m ==2|| m ==-1)          

       {              

                Console.Write("\t那就是李四赢");      

       }      

       else         

      {          

                Console.Write("\t那就是平手");        

       }

               Console.ReadLine();     

 }