2016年c#判断回文

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace consoleapplication1
{
    class Program
    {
        static void Main(string[] args)
        {            string s;
            s = Console.ReadLine();
            int len = s.Length;
            int j = 0;
            char[] a = new char[len];
            for (int i = len - 1; i >= 0; i--)
            {
                a[i] = s[j];
                j++;
            }
            int k = 0;
            for (int i = 0; i < len; i++)
            {
                if (a[i] == s[i])
                {
                    k++;
                }
            }
            if (k == len)
            {
                Console.WriteLine(s + "是回文");
            }
            else
            {
                Console.WriteLine(s + "不是回文！");
            }
 
        
        }
    }
}