Switch-2

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

namespace KararYapilariSwitch2
{
    class Program
    {
        static void Main(string[] args)
        {
            int ay;
            Console.Write("Ay : ");
            ay = Convert.ToInt32(Console.ReadLine());

            switch (ay)
            {
                case 12:
                    Console.WriteLine("Kış");
                    break;
                case 1:
                    Console.WriteLine("Kış");
                    break;
                case 2:
                    Console.WriteLine("Kış");
                    break;

                case 3:case 4:case 5:
                    Console.WriteLine("İlkbahar");
                    break;

                case 6:case 7:case 8:
                    Console.WriteLine("Yaz");
                    break;

                case 9: case 10: case 11:
                    Console.WriteLine("sonbahar");
                    break;

                default:
                    Console.WriteLine("Tanımsız ay");
                    break;
            }
            Console.ReadKey();
        }
    }
}