gistfile1.txt

//An exampple of Polymorphism in Swift

class A{
    func makeSound(){
        print("from A")
    }
}

class B : A{
    override func makeSound(){
        print("from B")
    }
}
class C: A {
    override func makeSound(){
        print("from A")
    }
}

let arr = [B(), C()]
for each in arr{
    each.makeSound()
}