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I have a problem with re-defining the initializer method. then how to re-define the move method?

robots.swift
```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 am a machine!")
}
}

class Robot : Machine {

override init() {

super.init()

}
override func move(_ direction: String) {
switch direction {
case "up" : location = Point( x = x , y += y)
case "down" : location = Point( x = x , y -= y)
case "right" : location = Point( x += x , y = y)
case "left" : location = Point( x -= x , y = y)
default: break
}
}
}

let robot1 = Robot
```

You are almost there, you can use dot notation on location to access the value you want to alter inside the switch statement. So the override method should look like this:

```class Robot: Machine {
override init() {
super.init()
}

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
}
}
}
```