animals

class Lion{
    let sound="Roar!!!!!"
    var name:String
    var isAlive = true

    init (name:String)
    {
        self.name=name
    }

    func makeSound(){
        if self.isAlive
        {
            print ("\(name) make sound:\(sound)")
        }
    }

    func eat(cow:Cow){
        cow.isAlive=false
    }
}

class Cow{
    let sound="Muuuuuuuuu"
    var name:String
    var isAlive=true

    init(name:String){
        self.name=name
    }

    func giveMilk(cat:Cat)->Bool{
        return self.isAlive
    }

    func makeSound(){
        if self.isAlive
        {
             print ("\(name) make sound:\(sound)")
        } else {
            print ("\(self.name) is dead, alla yerchamu ! neo bad girl")
        }
    }
}

class Cat{
    let sound="Miaooo , pussycat"
    var name:String
    var isAlive=true

    init(name:String){
        self.name=name
    }

    func drinkMilk(cow:Cow)->Bool{
        if cow.isAlive(){
            print ("milk, yammi yammi")
        } else {
            print ("WTF, i dont drink blood")
        }
    }

    func makeSound(){
        if self.isAlive
        {
             print ("\(name) make sound:\(sound)")
        } else {
            print ("\(self.name) is dead, alla yerchamu ! neo bad girl")
        }
    }

    func eatMouse (mouse:Mouse){
        mouse.isAlive=false
    }

}

class Mouse{
     let sound="Swiqqq Swiqqq"
    var name:String
    var isAlive=true

    init(name:String){
        self.name=name
    }

    func makeSound(){
        if self.isAlive
        {
             print ("\(name) make sound:\(sound)")
        } else {
            print ("\(self.name) is dead, alla yerchamu ! neo bad girl")
        }
    }
}

var lev=Lion(name: "lev")
var mush=Cow(name: "mush")

lev.makeSound()
mush.makeSound()
print ("cow give milk:\(mush.giveMilk())")
lev.eat(cow: mush)
mush.makeSound()
print ("cow give milk:\(mush.giveMilk())")