protocol ItoString {
    func toString()->String
}

class KFZ:ItoString{
    var name:String=""
    var preis:Double=0.0
    
    
    init(name:String, preis:Double){
        self.name=name
        self.preis=preis
    }
    
    func toString()->String{
        return "KFZ toString: \(name)  \(preis)"
    }
    func getPreis() -> Double {
        return preis
    }
    
    // toString
    var description :String {
        return "KFZ: \(name)  \(preis)"
    }
    
    
} // KFZ

class PKW:KFZ {
    var ps:Int32=0
    
    
    init(name:String, preis:Double, ps:Int32){
        self.ps=ps
        super.init(name: name,preis:preis)
    }
    
}


class LKW:KFZ {
    var ladevolumen:Double=0.0
    
    init(name:String, preis:Double, ladevolumen:Double){
        self.ladevolumen=ladevolumen
        super.init(name: name,preis:preis)
    }
    
}

var liste:[KFZ]=[]
//oder
var liste=[KFZ]()
liste.append( PKW(name:"Opel Vectra", preis:16300.22, ps:123 ))
liste.append( PKW(name:"Opel Adam", preis:13300.0,ps:165 ))
liste.append( LKW(name:"Man 2000", preis:83300, ladevolumen: 1234.6 ))

for kfz:KFZ in liste {
    print(kfz)
}