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Jarukorn Thuengjitvilas
1,357 PointsThe code of point is wrong
The code of point is wrong
class Machine {
var location: Point
init() {
self.location = Point(x: 0, y: 0)
}
func move(_ direction: String) {
print("Do nothing! I'm a machine!")
}
}
class Robot: Machine {
override func move(_ direction: String) {
switch direction {
case "Up":
self.location = Point(x: location.getX(), y:location.getY()+1)
case "Down":
self.location = Point(x: location.getX(), y:location.getY()-1)
case "Left":
self.location = Point(x: location.getX()-1, y:location.getY())
case "Right":
self.location = Point(x: location.getX()+1, y:location.getY())
default:
break
}
}
}
1 Answer

Steve Hunter
57,682 PointsHi Jarukorn,
You've nearly got that - within each case
you want to amend the location
property of the Robot
. So, if direction
is "Right
", you want to increment location.x
. "Up
" means you want to increment location.y
. The reverse is the case for the other directions. Use +=
and -=
to do the adjustment.
You end up with something like:
class Robot : Machine {
override func move(_ direction: String){
switch direction{
case "Up":
location.y += 1
case "Down":
location.y -= 1
case "Right":
location.x += 1
case "Left":
location.x -= 1
default:
break
}
}
}
I hope that helps.
Steve.