原文发布时间为：2009-03-09 —— 来源于本人的百度文章 [由搬家工具导入]

using System;

namespace unname

{

   public class Program//是否回文

    {

       public static void Main(string[] args)

        {

           string str= Console.ReadLine();

           int i=0,j=str.Length-1;

           //注释部分为另一种解法

            //for (i = 0; i <= (str.Length - 1) >> 1; i++)

            //{

            //    if (str[i] != str[str.Length - 1 - i])

            //        break;

            //}

            //if (i > (str.Length - 1) >> 1)

            //    Console.WriteLine("是回文");

            //else

            //    Console.WriteLine("不是回文");

            while (i < j)

            {

                if (str[i] != str[j])

                    break;

                else

                {

                    i++;

                    j--;

                }

            }

           if(i<j)

               Console.WriteLine("不是回文");

           else

               Console.WriteLine("是回文");

            Console.ReadLine();

       }

   }

}