namespace Ch1Duck;

public abstract class Duck(IFlyBehaviour flyBehaviour, IQuackBehaviour quackBehaviour) {
    public abstract void Display();

    public void PerformFly() {
        flyBehaviour.Fly();
    }
    
    public void PerformQuack() {
        quackBehaviour.Quack();
    }
}

public class MallardDuck() : Duck(new FlyWithWings(), new NormalQuack()) {
    public override void Display() {
        Console.WriteLine("I'm a real Mallard duck");
    }
}