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 2.0 Class Inheritance Creating a Subclass

Brian Patterson
Brian Patterson
19,588 Points

What is wrong with this?

Not sure what is wrong with this question. It works in swift.

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

Stepan Ulyanin
Stepan Ulyanin
11,318 Points

Hi, try this:

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
}

let someCar = Car(withDoors: 4, andWheels: 4)
Brian Patterson
Brian Patterson
19,588 Points

No I figured it out. class car: Vehicle { var numberOfSeats: Int override init(withDoors doors: Int, andWheels wheels: Int) { self.numberOfSeats = 4 super.init(withDoors: doors, andWheels: wheels)

}

}

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

Stepan Ulyanin
Stepan Ulyanin
11,318 Points

Note: always capitalize your class names or it will confuse other programmers