摘要：
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace 字符串处理{ class Program { static void Main(string[] args) { //string Str1 = "友情相逢"; //string Str2 = "用一生爱你"; //#region char的使用 //char a = 'a'; //Console.WriteLine("IsLetter方法判断a是 阅读全文