}
}
class Rectangle: Circle {var print = 7
override var area: String {
return super.area + " is now overridden as \(print)"
}
}let rect = Rectangle()
rect.radius = 25.0
rect.print = 3
println("Radius \(rect.area)")class Square: Rectangle {
override var radius: Double {
didSet {
print = Int(radius/5.0)+ 1
}
}
}let sq = Square()
sq.radius = 100.0
println("Radius \(sq.area)")When we run the above program using playground, we get the following result:
<stdin>:14:18: error: var overrides a 'final' var
override var area: String {
^
<stdin>:7:9: note: overridden declaration is here
var area: String {
^
<stdin>:12:11: error: inheritance from a final class 'Circle'
class Rectangle: Circle {