完成以下要求：string strNumber = "";

           do

           {

                Console.WriteLine("请输入数字");

                strNumber =Console.ReadLine();

                if (strNumber != "q")

                {

                    try

                    {

                        int number = Convert.ToInt32(strNumber);

                        Console.WriteLine("这个数字的2倍是{0}", number * 2);

                    }

                    catch//输入的是乱七八糟

                    {

                        Console.WriteLine("输入有误，请重新输入");

                    }

                }

                else//==q

{

                    Console.WriteLine("你输入的是q，程序退出！！！");

                }

           }while (strNumber != "q");

           Console.ReadKey();