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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