Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Object-Oriented Swift Class Inheritance Creating a Subclass

gio gulua
gio gulua
1,474 Points

I think online compiler is broken: create a subclass of Vehicle, named Car, that adds an additional stored property

https://teamtreehouse.com/library/objectoriented-swift-2/class-inheritance/creating-a-subclass

class Vehicle { var numberOfDoors: Int var numberOfWheels: Int

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

}

class Car: Vehicle { let numberOfseats: Int

override init(withDoors doors: Int, andWheels wheels: Int) {
    self.numberOfseats = 4
    super.init(withDoors: doors, andWheels: wheels)


}

}

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

Works perfectly fine in Playgrounds

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

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


class Car: Vehicle {
    let numberOfseats: Int

    override init(withDoors doors: Int, andWheels wheels: Int) {
        self.numberOfseats = 4
        super.init(withDoors: doors, andWheels: wheels)


    }
}


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

// Enter your code below

1 Answer

class Vehicle { var numberOfDoors: Int var numberOfWheels: Int

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

class Car : Vehicle {

// Subject asks for a default value = 4, I think it's easier to store it in a variable

var numberOfSeats : Int = 4

}

// Enter your code below

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

// Here you can

print(someCar.numberOfSeats)

// prints 4