Interfaces

fun main(args : Array<String>){
    val gagak = Bird(2)
    gagak.fly()
}

interface IFly{
    fun fly()
    val numberOfWings: Int
}

class Bird (override val numberOfWings: Int) : Ifly{
    override fun fly(){
        if(numberOfWings > 0) println("Flying with $numberOfWings wings")
       else println("I flying without wings")
    }
}