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Ling Cheng
3,168 PointsCan't this be work too?
What's the problem with this one? Thanks!
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! I'm a machine!")
}
}
// Enter your code below
class Robot: Machine {
override func move(direction: String) {
if direction == "UP" {
location.y + 1
}
else if direction == "DOWN" {
location.y - 1
}
else if direction == "LEFT" {
location.x + 1
}
else if direction == "RIGHT" {
location.x - 1
}
}
}
2 Answers
Steve Hunter
57,712 PointsHi there,
A few points on this.
FIrst, you might want to consider using a switch statement to handle the multiple options, rather than chaining a load of if statements together. There's a post about that here.
Secondly, you aren't changing the value of the location components. Saying location.y + 1 doesn't increment location.y you either need to assign that back into location.y or use the unary increment operator, ++:
// assign the value to change it
location.y = location.y + 1
// or increment
location.y++
You don't need to assign the result of the ++ operator - it works just fine like that.
Thirdly, I think the strings being input are capitalised initials, rather than ALL CAPS, so you may want to try testing for "Up" rather than "UP".
I hope that helps - let me kow how you get on.
Steve.
Ling Cheng
3,168 PointsThanks very much, I understand now.
Steve Hunter
57,712 PointsNo problem!
