using System;

​

public class Program

{

    public enum TimeOfDay

    {

        Morning = 0,

        Afternoon = 1,

        Evening = 2

    }

    public static void Main()

    {

        // using enums makes your code much clearer 

        WriteGreeting(TimeOfDay.Evening);

        // passing an integer is not clear to the reader

        WriteGreeting(0);

        // parsing enums

        Console.WriteLine(Enum.Parse(typeof(TimeOfDay), "Morning"));

    }

    static void WriteGreeting(TimeOfDay timeOfDay)

    {

        // switch based on the TimeOfDay passes in timeOfDay

        switch(timeOfDay)

        {

            case TimeOfDay.Morning:

                Console.WriteLine("Good morning!");

                break;

            case TimeOfDay.Afternoon:

                Console.WriteLine("Good afternoon!");

                break;

            case TimeOfDay.Evening:

                Console.WriteLine("Good evening!");

                break;

            default :

                Console.WriteLine("Case not found");

                break;  

        }

    }

    static void WriteGreeting(int timeOfDay)

    {

        // switch based on the integer passed

        switch(timeOfDay)

        {

            case 0:

                Console.WriteLine("Good morning!");

                break;

            case 1:

                Console.WriteLine("Good afternoon!");

                break;

            case 2:

                Console.WriteLine("Good evening!");

                break;

            default :

                Console.WriteLine("Case not found");

                break;  

        }

    }   

}