Variable Declaration and Manipulation in Swift 2

[VijayAT123]

import UIKit

 

class ViewController: UIViewController {

 

    @IBOutlet weak var mySlider: UISlider!

    @IBOutlet weak var myLabel: UILabel!

    @IBOutlet weak var myButton: UIButton!

    

    let targetNumber = Int (arc4random_uniform(UInt32(100)))

 

    override func viewDidLoad()

    {

        super.viewDidLoad()

        myLabel.text = "Target value: \(targetNumber)"

        mySlider.minimumValue = 1

        mySlider.maximumValue = 100

 

        // 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.

    }

    

    var score: Int = 0

    func scoreGenerator() -> (Int)

    {

        let mySliderValue = Int(mySlider.value)

        var difference = mySliderValue - targetNumber

        if  mySliderValue == targetNumber

        {

            score = 140

        }

        else if abs(difference) <= 20

        {

            score = 90

        }

        else

        {

            score = 40

        }

        return score

    }

    

    @IBAction func buttonPressed(sender: AnyObject)

    {

    

       var myAlert = UIAlertController(title: "Round Complete", message: "You landed on \(mySlider.value).  The target value was \(targetNumber).  Your score for this round is \(score).", preferredStyle: .Alert)

       

        let okAction = UIAlertAction(title: "OK", style: .Default, handler: nil)

        

        myAlert.addAction(okAction)

        

        self.presentViewController(myAlert, animated: true, completion: nil)

    }

}

 

I made score a global variable and tried to initialize it by setting Int = 0, but it returns as 0 even when the if, else if, and else statements are true.  Why is it doing this?