The code of point is wrong

Question

robots.swift

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
        }
    }
}

Answer 1 · 2017-02-23T15:06:18Z

February 23, 2017 3:06pm

Hi 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.

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Jarukorn Thuengjitvilas

Jarukorn Thuengjitvilas

The code of point is wrong

1 Answer

Steve Hunter

Steve Hunter