public enum Options : int
{
    PrintA = 1,
    PrintB = 2,
    PrintC = 4,
    PrintD = 8
}

public enum Options : int
{
    PrintA = 1,
    PrintB = 2,
    PrintC = 4,
    PrintD = 8
}

static bool GetBit(int number, int posLeftRight)
{
    return (number & (1 << posLeftRight)) != 0;
}

static void Main()
{
    // Using OR to "add" options up
    int x = Options.PrintA | Options.PrintB | Options.PrintD;
    /*
    x is now 11 (1+2+8) because:
      00000001 (1)
    | 00000010 (2)
    = 00000011 (3)
    | 00001000 (8)
    = 00001011 (11)
    */
    if(GetBit(x, 0))
    {
        // the if above checks this bit:
        //                      00000000
        //                             ^
        Console.WriteLine("A");
    }
    if(GetBit(x, 1))
    {
        // the if above checks this bit:
        //                      00000000
        //                            ^
        Console.WriteLine("B");
    }
    if(GetBit(x, 2))
    {
        // the if above checks this bit:
        //                      00000000
        //                           ^
        Console.WriteLine("C");
    }
    if(GetBit(x, 3))
    {
        // the if above checks this bit:
        //                      00000000
        //                          ^
        Console.WriteLine("D");
    }
}