Tip Calculator - NSDecimalNumber and Binary Operators

Question

I tried to use binary operators on NSDecimalNumbers, to make it work I used functions with the binary operators as the name of the functions ("/", "+", and "*"). For whatever reason I get fixit errors on each function making the code unable to compile.

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var billAmountLabel: UILabel!
@IBOutlet weak var customTipPercentLabel1: UILabel!
@IBOutlet weak var customTipPercentageSlider: UISlider!
@IBOutlet weak var customTipPercentLabel2: UILabel!
@IBOutlet weak var tip15Label: UILabel!
@IBOutlet weak var tipCustomLabel: UILabel!
@IBOutlet weak var total15Label: UILabel!
@IBOutlet weak var totalCustomLabel: UILabel!
@IBOutlet weak var inputTextField: UITextField!

let decimal100 = NSDecimalNumber(string: "100.0")
let decimal15Percent = NSDecimalNumber(string: "0.15")

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    inputTextField.becomeFirstResponder()
}

@IBAction func calculateTip(sender: AnyObject) {
    let inputString = inputTextField.text
    let sliderValue = NSDecimalNumber(integer: Int(customTipPercentageSlider.value))
    let customPercent = sliderValue / decimal100

    if sender is UISlider {
        customTipPercentLabel1.text = NSNumberFormatter.localizedStringFromNumber(customPercent, numberStyle: NSNumberFormatterStyle.PercentStyle)
    }

    if !inputString.isEmpty {
        let billAmount = NSDecimalNumber(string: inputString) / decimal100
    }

    if sender is UITextField {
        billAmountLabel.text = " " + formatAsCurrency(billAmount)

        let fifteenTip = billAmount * decimal15Percent
        tip15Label.text = formatAsCurrency(fifteenTip)
        totatal15Label.text = formatAsCurrency(billAmount + fifteenTip)


        let customTip = billAmount * customPercent
        tipCustomLabel.text = formatAsCurrency(customTip)
        totalCustomLabel.text = formatAsCurrency(billAmount + customTip)

        else
            billAmountLabel.text = " "
            tip15Label.text = " "
            total15Label.text = " "
            tipCustomLabel.text = " "
            totalCustomLabel.text = " "


        }
    }

func formatAsCurrency(number: NSNumber) -> String {
        return NSNumberFormatter.localizedStringFromNumber(number, numberStyle: NSNumberFormatterStyle.CurrencyStyle)
}
func  +(left: NSDecimalNumber, right: NSDecimalNumber) -> NSDecimalNumber {
        return left.decimalNumberByAdding(right)
}

func *(left: NSDecimalNumber, right: NSDecimalNumber) -> NSDecimalNumber {
        return left.decimalNumberByMultiplyingBy(right)
}

func /(left: NSDecimalNumber, right NSDecimalNumber) -> NSDecimalNumber {
        return left.decimalNumberByDividingBy(right)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

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Samuel Okunato

Samuel Okunato

Tip Calculator - NSDecimalNumber and Binary Operators