using System;

public class Program

{

    [Flags]

    public enum A {

        None = 0,

        A = 1,

        B = 2,

        C = 4

    }

    public static void Main()

    {

        for(var i = 0; i < 5; i++)

            XA(i);

    }

    private static void XA(int v){

        var a = (A)v;

        Console.WriteLine(

            $"#{v}");

        Console.WriteLine(

            $"Is C: {a is A.C}");

        Console.WriteLine(

            $"Has Flag #15: {a.HasFlag((A)15)}");

        Console.WriteLine(

            $"Has Flag B #{v}: {a.HasFlag(A.B)}");

        Console.WriteLine(

            $"Is B: {(a & A.B) == A.B}");

        Console.WriteLine(

            $"Is None: {(a & A.None) == A.None}");

        Console.WriteLine(Environment.NewLine);

    }

}