using System;

​

public class Program

{

    public static void Main()

    {

        // assign enum value

        Rating r1 = Rating.Excellent;

        Console.WriteLine($"r1 = {r1}");

        Console.WriteLine("***************************************************");

        // GetNames method can get the names of the constants in the enum

        foreach (string s in Rating.GetNames(typeof(Rating)))

            Console.WriteLine($"Rating Name = {s}");

        Console.WriteLine("***************************************************");

        // GetValues method can get the values of the constants in the enum

        foreach (int i in Rating.GetValues(typeof(Rating)))

            Console.WriteLine($"Rating Value = {i}");

        Console.WriteLine("***************************************************");

        // enum usage

        Rating IncrementRating(Rating r)

        {

            if (r == Rating.Excellent)

                return r;

            else

                return r + 1; // can use arithmetic operator on enum

        }

        Console.WriteLine($"IncrementRating result = {IncrementRating(Rating.Poor)}");

        Console.WriteLine("***************************************************");

    }

}

​

// enum declaration (no need to use new keyword)

enum Rating

{

    Poor,

    Average,

    Okay,

    Good,

    Excellent

}