using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace runnian{    class Program    {        static void Main(string[] args)        {            Console.Write("输入年 如2008:  ");            string s = Console.ReadLine().ToUpper();            int x=int.Parse(s);            if (x % 4 == 0 && x%100 != 0 || x % 400 == 0)            {            Console.WriteLine("{0}本年为闰年！",x);            }            else            {                Console.WriteLine("{0}本年不为闰年！",x);            }            Console.ReadLine();        }    }}

判断闰年