gistfile1.txt

protocol Shape {
    func calculateArea() -> Double
}

class Rectangle: Shape{
    let height: Double
    let width: Double
    
    init(height: Double, width: Double) {
        self.height = height
        self.width = width
    }
    
    func calculateArea() -> Double{
        return width * height
    }
}

class Circle: Shape{
    let radius: Double
    
    init(radius: Double) {
        self.radius = radius
    }
    
    func calculateArea() -> Double{
        return 3.14 * 3.14 * radius
    }
}

class MeasureArea {
    func area(obj: Shape) -> Double{
        return obj.calculateArea()
    }
}

let measureAreaObj = MeasureArea()
let rectObj = Rectangle(height: 5.0, width: 7.0)
let circleObj = Circle(radius: 10)
print("Area of rect is: \(measureAreaObj.area(obj: rectObj))")
print("Area of circle is: \(measureAreaObj.area(obj: circleObj))")