Checkpoint 7

/*
Your challenge is this: make a class hierarchy 
  for animals, starting with Animal at the top, 
  then Dog and Cat as subclasses, then Corgi and 
  Poodle as subclasses of Dog, and Persian and Lion 
  as subclasses of Cat.

But there’s more:
    The Animal class should have a legs integer 
      property that tracks how many legs the animal has.
    The Dog class should have a speak() method that 
      prints a generic dog barking string, but each of 
      the subclasses should print something slightly 
      different.
    The Cat class should have a matching speak() method, 
      again with each subclass printing something 
      different.
    The Cat class should have an isTame Boolean property,
      provided using an initializer.

https://www.hackingwithswift.com/quick-start/beginners/checkpoint-7

*/

class Animal {
    var legs = 4
    init(legs: Int) {
        self.legs = legs
    }
}


class Dog: Animal {
    func speak() { print("woof") }
}


class Corgi: Dog {
    override func speak() { print("Your Majesty?") }
}


class Poodle: Dog {
    override func speak() { print("yip") }
}


class Cat: Animal {
    var isTame: Bool
    
    init (isTame: Bool, legs: Int) {
        self.isTame = isTame
        super.init(legs: legs)
    }
    
    func speak() { print("meow") }
}


class Persian: Cat {
    override func speak() { print("hiss") }
    
    init() { super.init (isTame: true, legs: 4 ) }
}


class Lion: Cat {
    override func speak() { print("rawr") }
    
    init() { super.init (isTame: false, legs: 4 ) }
}


let lion = Lion()
print(lion.legs)