init.swift

struct Rectangle {
    var width: Double = 10
    var area: Double = 100

    var height: Double {
        get {
            return area / width
        }
        set (height) {

            self.area = height * width
        }
    }
}
var newRectangle = Rectangle()
newRectangle.area // 10
newRectangle.width = 1
newRectangle.area = 3

/////////////////////////////////////////////////////


struct Rectangle1 {
    var width1: Double
    var area1: Double

    init (width1: Double, area1: Double ){
    self.width1 = width1
    self.area1 = area1
    }
    var height1: Double {
        get {
            return area1 / width1
        }
        set (height1) {

            self.area1 = height1 * width1
        }
    }
}
var newRectangle1 = Rectangle1(width1: 1, area1: 3 )
newRectangle1.area1