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Michel Ortega
2,279 PointsWhat am I missing?
It seems that theres a problem with my Robot subclass. Can you please tell me what it is and how to avoid it next time. I feel's like im almost there learning the polymorphism practice and theory. SOS
class Point {
var x: Int
var y: Int
init(x: Int, y: Int) {
self.x = x
self.y = y
}
}
class Machine {
var location: Point
init() {
self.location = Point(x: 0, y: 0)
}
func move(_ direction: String) {
print("Do nothing! Im a machine!")
}
}
// Enter your code below
class Robot: Machine{
override init() {
self.location = Point(x: 0, y: 0)
}
override func move(_ direction: String){
switch direction{
case "Up":
self.y += 1
case "Left":
self.x += 1
default:
break
}
}
}
2 Answers
Reed Carson
8,306 PointsIn your switch statement you are referring to a "self.y" and "self.x". Neither Robot or Machine class has a property named 'x' or 'y', but the class Point does. Robot's property 'location' is of type Point, and its the 'x' and 'y' properties of 'location' that you are trying to change. I bet you can take it from here. The answer is at the bottom if you can't figure it out.
also you don't need to override the init because you aren't changing it.
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self.x needs to be location.x and self.y needs to be location.y
Michel Ortega
2,279 PointsThanks a lot Reed. Now I see things more clearly and I think I do get it now, thanks to you. Again, thanks a lot. xoxo