實現(xiàn)幸運抽獎

1. 需求說明
   (1) . 登錄成功后，用戶選擇幸運抽獎菜單，進入幸運抽獎功能
   (2) . 輸入會員卡號，系統(tǒng)生成5個4位隨機數(shù)作為幸運數(shù)字
   (3) . 如果會員卡號是其中之一，則成為本日幸運會員；否則不是幸運會員

       int max = 99999;
       int min = 1000;
       Random rd = new Random();
       rd.Next(min, max);
       int a = 0;
       int id = 0;
       string user = "";
       string key = "";
       string b = "";
       Console.WriteLine("*****歡迎進入獎客富翁系統(tǒng)*****");
       Console.WriteLine("           1.注冊");
       Console.WriteLine("           2.登錄");
       Console.WriteLine("           3.抽獎");
       Console.WriteLine("******************************");
       Console.WriteLine("請選擇菜單：");
       a = Convert.ToInt32(Console.ReadLine());
       switch (a)
       {
           case 1:
               Console.WriteLine("[獎客富翁系統(tǒng)>注冊]");
               Console.WriteLine("請?zhí)顚懹脩糇孕畔?");
               Console.WriteLine("用戶名:");
               user = Console.ReadLine();
               Console.WriteLine("密碼:");
               key = Console.ReadLine();
               Console.WriteLine("注冊成功，請記好你的會員卡號");
               Console.WriteLine("用戶名\t\t密碼\t\t會員卡號");
               Console.WriteLine("{0}\t\t{1}\t\t{2}", user, key, rd.Next(min, max));
               Console.WriteLine("繼續(xù)嗎?(y/n)");
               b = Console.ReadLine();
               break;
           case 2:
               Console.WriteLine("[獎客富翁系統(tǒng)>登錄]");
               Console.WriteLine("請輸入用戶名:");
               user = "admin";
               key = "123456";
               string yonghu = Console.ReadLine();
               Console.WriteLine("請輸入密碼:");
               string mima = Console.ReadLine();
               for (int i = 0; i < 4; i++)
               {
                   if (user == yonghu & key == mima)
                   {
                       Console.WriteLine("歡迎您:{0}", yonghu);
                       break;
                   }
                   else
                   {
                       Console.WriteLine("你還剩{0}次機會", 3 - i);
                       continue;
                   }
               }
               break;
           case 3:
               Console.WriteLine("[獎客富翁系統(tǒng)>抽獎]");
               Console.WriteLine("請輸入你的卡號");
               id = Convert.ToInt32(Console.ReadLine());
               Console.WriteLine("今日的幸運數(shù)字為：");
               for (int i = 0; i < 4; i++)
               {
                   Console.WriteLine(rd.Next(min, max));
               }
               if (rd.Next(min, max) == id)
               {
                   Console.WriteLine("恭喜！你是本日的幸運會員!");
               }
               else
               {
                   Console.WriteLine("抱歉！您不是本日的幸運會員！");
               }
               break;
       }
       Console.WriteLine("繼續(xù)嗎？（y/n）");
       b = Console.ReadLine(); switch (b)
       {
           case "n":
               Console.WriteLine("系統(tǒng)退出，謝謝使用");
               break;
           case "y":
               Console.WriteLine("");
               break;
       }
       Console.ReadKey();