using System;using System.Collections;using System.Collections.Generic;using System.Net;using System.IO;using System.Text;using System.Drawing;using System.Text.RegularExpressions; namespace ConsoleApplication1{    class Program    {        static string GetHtml(string url)        {                            string html = string.Empty;            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;            request.Timeout=20*1000;            HttpWebResponse response = request.GetResponse() as HttpWebResponse;            Stream s = response.GetResponseStream();            StreamReader sr = new StreamReader(s,Encoding.Default);            html = sr.ReadToEnd();            return html;        }        static void Main(string[] args)        {              try            {                Operation();                           }            catch (Exception ex)            {                 Console.WriteLine(ex.Message);            }            Console.ReadKey();        }         private static void Operation()        {            try            {                int numberA = Convert.ToInt32(Console.ReadLine());                int numberB = Convert.ToInt32(Console.ReadLine());                int result = numberA / numberB;                Console.WriteLine("结果:" + result);             }            catch (Exception ex)            {                throw;//注意如果写上throw说明将捕获到的异常再次抛给调用函数，如果不写，则说明异常已经默认处理            }        }                         }  }