title: Cannot assign a value of type 'int' to a value of type 'String?'
body: <p>Here is my code, I am a beginner using swift and my code does not work, the application should take the value of 'ageInput' textField and multiply it by 7 then show the results inside resultLabel, I always get the error:</p>
  
  <p>Cannot assign a value of type 'int' to a value of type 'String?'</p>
  
  <pre><code>class ViewController: UIViewController {
      @IBOutlet weak var resultLabel: UILabel!
      @IBOutlet weak var ageInput: UITextField!
      @IBAction func findAge(sender: AnyObject) {
  
          var catAge = ageInput.text.toInt() ?? 0
  
          catAge = catAge * 7 ?? 0
  
          resultLabel.text = catAge
  
      }
         override func viewDidLoad() {
          super.viewDidLoad()
          // Do any additional setup after loading the view, typically from a nib.
      }
  </code></pre>
  
  <p>Where did i go wrong?</p>