计算闰年

Console.WriteLine("请输入一个年份");
            int n;
            n = Convert.ToInt32(Console.ReadLine());
            if (n % 400 == 0 || n % 4 == 0 && n % 100 != 0)
            {
                Console.WriteLine("是闰年");
            }
            else
            {
                Console.WriteLine("不是闰年");
            }