Swift
length = breadth * 10 }
init(frombre bre: Double) { length = bre * 30 }
init(_ area: Double) { length = area } }
let rectarea = Rectangle(180.0) println("area is: \(rectarea.length)")
let rearea = Rectangle(370.0) println("area is: \(rearea.length)")
let recarea = Rectangle(110.0) println("area is: \(recarea.length)") When we run the above program using playground, we get the following result: area is: Optional(180.0) area is: Optional(370.0) area is: Optional(110.0)
Default Initializers Default initializers provide a new instance to all its declared properties of base class or structure with default values. class defaultexample { var studname: String? var stmark = 98 var pass = true } var result = defaultexample() 141