Test enums, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        [Flags]
        public enum Choices
        {
            First   = 1 << 0,   //1
            Second  = 1 << 1,   //2
            Third   = 1 << 2,   //4
            Fourth  = 1 << 3,    //8
            
            FirstOrSecond = (First | Second)
        }
               
        public static bool IsFirstOrFourth(Choices self)
        {
            return (self & (Choices.First | Choices.Fourth)) > 0;
        }
                
        public static void Main(string[] args)
        {
            Choices allowed =  (Choices.First | Choices.Third);
            
            Console.WriteLine("using inline variable:");
            Console.WriteLine(allowed.HasFlag(Choices.Third));
            Console.WriteLine(allowed.HasFlag(Choices.Fourth));
            
            Console.WriteLine("\nusing flag of extra enum option:");
            Console.WriteLine(Choices.FirstOrSecond.HasFlag(Choices.First));
            Console.WriteLine(Choices.FirstOrSecond.HasFlag(Choices.Third));
            
            Console.WriteLine("\nusing method:");
            Console.WriteLine(IsFirstOrFourth(Choices.First));
            Console.WriteLine(IsFirstOrFourth(Choices.Second));
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,11 sec, cpu time: 0,12 sec, average memory usage: 16 Mb, average nr of threads: 3, absolute service time: 0,26 sec