class NameShape {
  var numberOfSides: Int = 0
  var name: String

  init(name: String) {
    self.name = name
  }

  func simpleDescription() -> String{
    return "A shape with \(numberOfSides) sides."
  }
}

var shape: NameShape = NameShape(name: "Triangulo")
shape.numberOfSides = 3
var descripcion = shape.simpleDescription()
print(descripcion)

class Square: NameShape {
  var sideLength: Double

  init(sideLength: Double, name: String) {
    self.sideLength = sideLength
    super.init(name: name)
    numberOfSides = 4
  }

  func area() -> Double {
    return sideLength * sideLength
  }

  override func simpleDescription() -> String {
    return "A square with sides of length \(sideLength)."
  }
}

let test: Square = Square(sideLength: 5.2, name: "my test square")
test.area()
test.simpleDescription()

class Circle: NameShape {
  var radius: Double

  init(radius: Double, name: String) {
    self.radius = radius
    super.init(name: name)
  }

  func circunference() -> Double {
    return radius * 3.1416
  }

  func area() -> Double {
    return 3.14159 * radius * radius
  }

  override func simpleDescription() -> String {
    return "A circle with a radius of \(radius)."
  }
}

let círculo: Circle = Circle(radius: 2.5, name: "Menta & Bolita")
print("El área de \(círculo.name) es \(círculo.area()) cm2.")
círculo.name
print(círculo.simpleDescription())