using System;

​

public class Program

{

    //[Flags]

    //[Flags]

    public enum Colors

    {

        Yellow, // 0

        Green, // 1

        Red, // 2

        Blue, // 3

    }

​

    public enum ColorsBits

    {

        Yellow = (1 << 0), // 1 = 0b0001

        Green = (1 << 1), // 2= 0b0010

        Red = (1 << 2), // 4= 0b0100

        Blue = (1 << 3), // 8= 0b1000

    }

​

    public static void Main()

    {

        {

            Colors a = Colors.Green | Colors.Red;

            Console.WriteLine("aaaa" + a);

            Console.WriteLine("aaaa" + (int)Colors.Green);

        }

​

        {

            ColorsBits a = ColorsBits.Green | ColorsBits.Red;

            Console.WriteLine("aaaa" + a);

            Console.WriteLine("aaaa" + (int)ColorsBits.Green);

        }

    }

}