判断回文：

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace 判断回文{    class Program    {        static void Main(string[] args)        {            string s = Console.ReadLine();            int len=s.Length;            int Flag=0;            for (int i = 0; i < (len-1)/2; i++)            {                if(s[i]!=s[len-1-i])                {                    Flag=1;                    break;                }            }            if(Flag==1)                Console.WriteLine("no");            else                Console.WriteLine("yes");        }    }}

 

数组中最大最小值，平均值：

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            int[] num = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };            int max=num[0];            int min = num[0];            float sum=num[0];            for(int i=1;i
    
     num[i])                    min=num[i];                sum+=num[i];            }            float average = sum  / num.Length;            Console.WriteLine("最大值为{0}", max);            Console.WriteLine("最小值为{0}", min);            Console.WriteLine("平均值为{0}", average);        }    }}