Keep getting an error when i check work on this? What is wrong?

Hi there!! There are several issues you have going on at a glance. I had trouble with this one not too long ago, so I will help out as best as I can.

The major issue I had was in the func statement. I had the exact same line of syntax in the function statement like you have. It turns out that you do not need the -> Double. The same thing applies to the override func statement.

Next, you don't need to declare return statements. It assumed that it is returned, if I remember correctly.

Lastly, you need to declare the override func statement before the var cornerRadius statement.

Give this code a go:

class Button {
  var width: Double
  var height: Double

  init(width:Double, height:Double){
    self.width = width
    self.height = height
  }

  func incrementBy(points: Double){
    width += points
    height += points
  }
}

class RoundButton: Button {
override func incrementBy(_ points: Double = 7.0) {
}
  var cornerRadius: Double = 5.0
} 

Actually, you'll want to keep your return statements. I don't really know what language the person above might be thinking of, perhaps a variant, but with regular Swift, you'll want to be fairly explicit with returns.

However, keep in mind that the functions will exit immediately upon those return statements, and all code underneath your return lines will not be executed. Return literally means "return from this function now", so you have to return as the very last step.

If your intention there is to return two values, you'll have to make it an object, an array, or something else with multiple pieces allowed. (A double is just one solitary decimal number)