using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 namespace 第六天_do_while循环

 {

     class Program

     {

         static void Main(string[] args)

         {

             string answer = "";

             while (answer != "q")

             {

                 Console.WriteLine("请输入您要增倍的数字：");

                 answer = Console.ReadLine();

                 if (answer != "q")

                 {

                     try

                     {

                         int answer02 = Convert.ToInt32(answer);

                         Console.WriteLine("您输入数字的两倍是：{0}", answer02 * );

                     }

                     catch

                     {

                         Console.WriteLine("请输入的格式有误，请重新输入：");

                     }

                 }

                 else

                 {

                     Console.WriteLine("您请求了程序退出");

                 }

             }

         Console.ReadKey();

         }

     }

 }