static void Main(string[] args)
{
Duck duck = new Duck();
Penguin penguin = new Penguin();
Dolphin dolphin = new Dolphin();
duck.Move();
duck.Eat();
penguin.Move();
penguin.Eat();
dolphin.Move();
dolphin.Eat();
IFlyable duck2 = duck as IFlyable;
duck2.Fly();
IWalkable penguin2 = penguin as IWalkable;
penguin2.Walk();
ISwimable dolphin2 = dolphin as ISwimable;
dolphin2.Swim();
string direction = Direction.down.ToString();
duck.Move(direction);
direction = Direction.up.ToString();
penguin.Move(direction);
Console.ReadKey();
}
public void Swim()
{
_swimable.Swim();
}