enum Shape {
case Dot
case Circle(radius: Double) // Require argument name!
case Square(Double)
case Rectangle(width: Double, height: Double) // Require argument names!
func area() -> Double {
switch self {
case Dot:
return 0
case Circle(let r): // Assign the associated value to the constant 'r'
return 3.14*r*r
case Square(let l):
return l*l
case Rectangle(let w, let h):
return w*h
}
}
}
var shape = Shape.Circle(radius: 3.0)
shape.area()//28.26
shape = Shape.Dot
shape.area()//0.0
shape = .Square(2)
shape.area()//4.0
shape = .Rectangle(width: 3, height: 4) // Argument names required
shape.area()//12.0
