using System;

​

public class Program

{

    enum Planets

    {

        Mercury,

        Venus,

        Earth,

        Mars,

        Jupiter

    }

​

    enum Planets1

    {

        Mercury = 11,

        Venus = 12,

        Earth = 13,

        Mars = 14,

        Jupiter = 15

    }

​

    enum Planets2

    {

        Mercury = 1,

        Venus = 2,

        Earth,

        Mars,

        Jupiter

    }

​

    public static void Main()

    {

        Console.WriteLine("\n----------Null----------\n");

        Planets? planet1 = null;    

        Console.WriteLine(planet1 == null); // Check if its null

        Console.WriteLine("\n----------Print name----------\n");

        Planets planet;

        planet = Planets.Mercury;

        Console.WriteLine(planet);

        Console.WriteLine("\n----------var : print name----------\n");

        var planet2 = Planets.Mercury;

        Console.WriteLine(planet2);

        Console.WriteLine("\n----------Explicit cast to print associated value----------\n");

        int planetNumber = (int)Planets.Mercury; // explicit cast

        Console.WriteLine(planetNumber);

        Console.WriteLine("\n----------Explicit cast to print name from associated value----------\n");

        // To get name from value

        Planets planet3 = (Planets)planetNumber; // explicit cast

        Console.WriteLine(planet3);

        // OR: using var

        Console.WriteLine("\n----------var : print name from associated value----------\n");

        var planet4 = (Planets)planetNumber;

        Console.WriteLine(planet4);

    }

}