CH 6 iOS

Here is my UIViewController class:

//

//  ViewController.swift

//  CH6Ex1Circle

//

//  Created by stu2017 on 10/24/17.

//  Copyright © 2017 stu2017. All rights reserved.

//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var tbRad: UITextField!

    @IBOutlet weak var lblCirc: UILabel!

    @IBOutlet weak var lblArea: UILabel!

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    @IBAction func btnCalc(_ sender: UIButton) {

        let rad=Double(tbRad.text!);

        let circ1=Circle(radius:rad!);

        let a=String(format: "%.2f", circ1.getArea());

        let c=String(format: "%.2f", circ1.getCircumference());

        lblArea.text="Area: \(a)";

        lblCirc.text="Circumfrence: \(c)";

    }

}

 Here is my circle class

//

//  Circle.swift

//  CH6Ex1Circle

//

//  Created by stu2017 on 10/24/17.

//  Copyright © 2017 stu2017. All rights reserved.

//

import Foundation

class Circle {

    var radius = 0.0

    

    init(radius: Double) { // Constructor

        self.radius = radius

        

    }

    var Area: Double{

        return 3.14*(radius*radius)

    }

    

    func getArea() -> Double {

        return 3.14*(radius*radius)

    }

    

    var Circumference: Double {

        return 2*3.14*radius

    }

    func getCircumference() -> Double{

        return 2*3.14*radius

    }

}