using System;
namespace ConsoleApp10
{
** class Program**
** {**
** static void Main(string[] args)**
** {**
** Console.WriteLine("Hello World!");**
** //////////////////////////////////////////**
** ///"123456789" ="987654321"**
** string str = "123456789";**
** Console.WriteLine("{0}", str);**
** Console.WriteLine("string就是数组一种{0}", str[0]);**
** char[] cha = str.ToCharArray();**
** for (int i = 0; i < cha.Length / 2; i++)**
** {**
** char temp;**
** temp = cha[i];**
** cha[i] = cha[cha.Length - 1 - i];**
** cha[cha.Length - 1 - i] = temp;**
** }**
** str = new string(cha);**
** Console.WriteLine("{0}", str);**
** //////////////////////////////////////////**
** ///hell c rust =rust c hell**
** string str1 = "hell c rust";**
** Console.WriteLine("数组0:{0}", str1);**
** string[] str2 = str1.Split(new char[] { ' ', '9' });**
** string[] str4 = str1.Split(' ', '9', StringSplitOptions.RemoveEmptyEntries);**
** //string[] str4 = str1.Split(new char[] { ' ', '9' }, StringSplitOptions.RemoveEmptyEntries);**
** //分隔后遇到的空字符串不作为数组元素的一项返回**
** //StringSplitOptions.RemoveEmptyEntries**
** for (int i = 0; i < str2.Length / 2; i++)**
** {**
** string temp;**
** temp = str2[i];**
** str2[i] = str2[str2.Length - 1 - i];**
** str2[str2.Length - 1 - i] = temp;**
** }**
** str1 = string.Join(" ", str2);**
** Console.WriteLine("数组1:{0}", str1);**
** /////////////////////////////////////////**
** ///[email protected] 截取 hdqun、163.com**
** string str5 = "[email protected]";**
** string str6 = str5.Substring(0, 7);**
** string str7 = str5.Substring(8, 7);**
** Console.WriteLine("{0}", str6);**
** Console.WriteLine("{0}", str7);**
** int aa = str5.IndexOf("@");**
** string str8 = str5.Substring(0, aa);**
** Console.WriteLine("{0}", str8);**
** int bb = str5.Length;**
** string str9 = str5.Substring(aa+1, bb-aa-1);**
** Console.WriteLine("{0}", str9);**
** Console.ReadKey();**
** }**
** }**
}