using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 namespace _11._1练习

 {

     class Program

     {

         static void Main(string[] args)

         {

             while (true)

             {

                 //随机验证码     整型

                 Random x = new Random();

                 int ranx = x.Next(, );

                 //把整型的随机数转换成字符串，方便进行字符串比对

                 string ran = Convert.ToString(ranx);

                 //打印验证码

                 Console.WriteLine("验证码：" + ranx);

                 Console.WriteLine();

                 Console.Write("验  证：");

                 //获取用户输入的内容

                 string user = Console.ReadLine();

                 //防止用户误操作，把空格替换成空字符串

                 string str = user.Replace(" ", "");

                 //检测用户输入内容的长度，长度符合---下一步，长度不符合---长度错误

                 int strleg = str.Length;

                 if (strleg == )

                 {

                     //开始比对字符串

                     if (str == ran)

                     {

                         Console.WriteLine();

                         Console.ForegroundColor = ConsoleColor.Red;

                         Console.WriteLine("验证成功！！！");

                         break;

                     }

                     else

                     {

                         Console.ForegroundColor = ConsoleColor.Red;

                         Console.WriteLine();

                         Console.WriteLine("输入错误！！！");

                         Console.ForegroundColor = ConsoleColor.White;

                         Console.WriteLine();

                     }

                 }

                 else

                 {

                     Console.ForegroundColor = ConsoleColor.Red;

                     Console.WriteLine();

                     Console.WriteLine("长度错误！！！");

                     Console.ForegroundColor = ConsoleColor.White;

                     Console.WriteLine();

                 }

             }

             Console.ReadLine();

         }

     }

 }