Page 148

Swift

println("area of rectangle is \(area.length*area.breadth)") When we run the above program using playground, we get the following result: area of rectangle is 72.0 Here the structure 'rectangle' is initialized with members length and breadth as 'Double' datatypes. Init() method is used to initialize the values for the newly created members length and double. Area of rectangle is calculated and returned by calling the rectangle function.

Setting Property Values by Default Swift language provides Init() function to initialize the stored property values. Also, the user has provision to initialize the property values by default while declaring the class or structure members. When the property takes the same value alone throughout the program we can declare it in the declaration section alone rather than initializing it in init(). Setting property values by default enables the user when inheritance is defined for classes or structures. struct rectangle { var length = 6 var breadth = 12 } var area = rectangle() println("area of rectangle is \(area.length*area.breadth)") When we run the above program using playground, we get the following result: area of rectangle is 72.0 Here instead of declaring length and breadth in init() the values are initialized in declaration itself.

Parameters Initialization In Swift language the user has the provision to initialize parameters as part of the initializer's definition using init(). struct Rectangle { var length: Double var breadth: Double var area: Double

init(fromLength length: Double, fromBreadth breadth: Double) { 136

​Quick is just a powerful and spontaneous programming language for macOS, iOS, watchOS and tvO...  

...

Advertisement