import Cocoa


class Car {
  static var cout = 0
  init() {
    Car.cout += 1
  }
  
  static func getCount() -> Int {cout}
}

let c0 = Car()
let c1 = Car()
let c2 = Car()
// 3
print(Car.getCount())


struct Point {
    var x = 0.0, y = 0.0
    mutating func moveBy(deltaX: Double, deltaY: Double) {
        x += deltaX
        y += deltaY
        // self = Point(x: x + deltaX, y: y + deltaY)
    }
}

enum StateSwitch {
    case low, middle, high
    mutating func next() {
        switch self {
            case .low:
                self = .middle
            case .middle:
                self = .high
            case .high:
                self = .low
        }
    }
}