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iOS Object-Oriented Swift 2.0 Class Inheritance Creating a Subclass

Sıla Çakıcı
Sıla Çakıcı
371 Points
Posted by Sıla Çakıcı
Sıla Çakıcı
371 Points

Class Inheritance

Hi, I cannot find what is wrong with my code? It does not compile. Also, I have a problem with understanding why is the code is written like "withDoors doors: Int, andWheels wheels: Int", but not only as "doors: Int, wheels: Int"

Can you help me?

classes.swift 
class Vehicle {
    var numberOfDoors: Int
    var numberOfWheels: Int

    init(withDoors doors: Int, andWheels wheels: Int) {
        self.numberOfDoors = doors
        self.numberOfWheels = wheels
    }
}

// Enter your code below
class Car: Vehicle {
  let numberOfSeats: Int = 4
 override init(withDoors doors: Int, andWheels wheels: Int) {
        super.init(withDoors: doors, andWheels: wheels)
}

let someCar = Car(withDoors:4, andWheels: 4)

3 Answers

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

So, so close! You left out a closing curly brace:

class Car: Vehicle {
  let numberOfSeats: Int = 4
  override init(withDoors doors: Int, andWheels wheels: Int) {
    super.init(withDoors: doors, andWheels: wheels)
  }
}

let someCar = Car(withDoors:4, andWheels: 4)

Happy coding!

Gavin Maxwell
Gavin Maxwell
3,521 Points
Gavin Maxwell
Gavin Maxwell
3,521 Points

You're simply missing a closing curly-brace. Always try to indent your code correctly as it helps finding brace alignment issues. Thankfully Xcode does most of the work for you. Correct working code:

class Vehicle {
    var numberOfDoors: Int
    var numberOfWheels: Int

    init(withDoors doors: Int, andWheels wheels: Int) {
        self.numberOfDoors = doors
        self.numberOfWheels = wheels
    }
}

// Enter your code below
class Car: Vehicle {
    let numberOfSeats: Int = 4
    override init(withDoors doors: Int, andWheels wheels: Int) {
        super.init(withDoors: doors, andWheels: wheels)
    }
}

let someCar = Car(withDoors:4, andWheels: 4)