03.if 和 switch结合练习

namespace _04.练习01
{
    class Program
    {
        static void Main(string[] args)
        {
            //请用户输入年份,再输入月份,输出该月有多少天
            Console.WriteLine("请输入年份:");
            int year =Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("请输入月份:");
            int month = Convert.ToInt32(Console.ReadLine());
            
                switch (month)
                {
                    case 1:
                    case 3:
                    case 5:
                    case 7:
                    case 8:
                    case 10:
                    case 12:
                        Console.WriteLine("该月有31天!");
                        break;
                    case 4:
                    case 6:
                    case 9:
                    case 11:
                        Console.WriteLine("该月有30天!");
                        break;
                    case 2:
                    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
                    {
                        Console.WriteLine("该月有29天.");
                    }
                    else
                    {
                        Console.WriteLine("该月有28天.");
                    }
                        break;
                }
            Console.ReadKey();
        }
    }
}