InheritanceCompositionExample_1B.swift

class Animal {
  func eat() {
    print("nom nom nom")
  }
}

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

class Cat: Animal {
  func meow() {
    print("meow!")
  }
}

let Quinn = Dog()
Quinn.bark() // "woof!"
Quinn.eat() // "nom nom nom"

let Riccardo = Cat()
Riccardo.meow() // "meow!"
Riccardo.eat() // "nom nom nom"