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Start your free trialMaanvir Sidhu
3,301 PointsIn the editor you've been provided with two classes - Point to represent a coordinate point and Machine. The machine has
I don't get why i am getting compiler error?
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!")
}
}
class Robot: Machine {
override func move(_ direction: String) {
switch direction {
case "Up": location.y ++
case "Down": location.y --
case "Left": location.x --
case "Right": location.x ++
default: break
}
}
}
2 Answers
andren
28,558 PointsThe ++ and -- operators are not supported in Swift 3. If you want to increase or decrease a variable using shorthand you have to use += 1
or -= 1
instead, like this:
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!")
}
}
class Robot: Machine {
override func move(_ direction: String) {
switch direction {
case "Up": location.y += 1
case "Down": location.y -= 1
case "Left": location.x -= 1
case "Right": location.x += 1
default: break
}
}
}
Then your code will work.
Maanvir Sidhu
3,301 PointsThanks this works.