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# How can I change position of Robot?

Help me please!

classes.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'm a machine!")
}
}

// Enter your code below

class Robot: Machine {
override func move(direction: String) {
switch direction{
case "Up": location = Point(x: self.location.x + 1, y: self.location.y + 0)
//here will be rest of "switch"
default: break
}
}

}
```

## 1 Answer

Hi Andrey,

Moving the location of the robot is actually a bit simpler. There are two simple ways of updating it.

See below.

```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) {
switch direction{
case "Up": self.location.y = self.location.y + 1
case "Down": self.location.y = self.location.y - 1
case "Left": self.location.x--
case "Right": self.location.x++
default: break
}
}
}

// Then test it in the Playground

let myRobot = Robot()
myRobot.move("Right")
print("Point X: \(myRobot.location.x), Point Y: \(myRobot.location.y)")
```

As you can see, I tested this in the Playground. It really helps to visualize everything and see what is going on.

I hope that helps,

Mike

PS: Thanks to the awesome resources on Team Treehouse, I launched my first app.

Now you can practice writing Swift code directly on your iPhone :-)

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