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iOS

Posted by Antonio Coelho
Antonio Coelho
30 Points

Adding Decimals to a Calculator made on xCode6 using swift ( made for iOS8)

Hi, I recently got into programming apps on Xcode using apples latest language swift. I'm currently only trying to make simple apps. I decided to start with a calculator and it went great , it works perfectly apart from one issue it doesn't support decimals so for example when you types in 3 / 2 , where we know the answer should be 1.5 it shows the answer as 1 as it does not understand 1.5 as a number. The rest works fine however I'm looking to adding the decimal functionality , can anyone help me?

2 Answers

Meek D
Meek D
3,457 Points
Meek D
Meek D
3,457 Points

I think your function should return a float. For example when you take two integers like 3 and 2 , once it is divided you will get a decimal number. Hope that helps

Antonio Coelho
Antonio Coelho
30 Points

How do I do this though ? How do I make it return a float?

Meek D
Meek D
3,457 Points

func (input_one : Int , input_two :Int ) ->Float { return input_one + input_two }

Antonio Coelho
Antonio Coelho
30 Points

Hi, I'm really starting swift so I'm kinda confused. Maybe if I shoe you my code and you tell me what to change? class ViewController: UIViewController {

@IBOutlet weak var Screen: UILabel!
var firstNumber =  Int()
var secondNumber = Int()
var isTypingNumber = false
var result = Int()
var operation = ""



@IBAction func number(sender: AnyObject) {
    var number = sender.currentTitle
    if isTypingNumber == true {
        Screen.text = Screen.text! + number!!
    } else {
        Screen.text = number;
    }
    isTypingNumber = true
}

@IBAction func operation(sender: AnyObject) {
    isTypingNumber = false
    firstNumber = Screen.text!.toInt()!
    operation = sender.currentTitle!!
}


@IBAction func equals(sender: AnyObject) {
    secondNumber = Screen.text!.toInt()!
    if operation == "+" {
        result = firstNumber + secondNumber
    } else if operation == "-" {
        result = firstNumber - secondNumber
    } else if operation == "x" {
        result = firstNumber * secondNumber
    } else {
        result = firstNumber / secondNumber
    }
    Screen.text = "\(result)"
}


@IBAction func clear(sender: AnyObject) {
    firstNumber = 0
    secondNumber = 0
    isTypingNumber = false
    result = 0
    Screen.text = "\(result)"
}
Meek D
Meek D
3,457 Points
Meek D
Meek D
3,457 Points

Alright i just got home sorry ... It is good when you start simple so I will show you an example where we have two UITextField and 4 operations buttons and the display label . So the way this calculator works the user entered two integers then pressed the operation button and the result will be displaying into the UILabel 

   class ViewController: UIViewController {
@IBOutlet weak var input_two: UITextField!
@IBOutlet weak var displaylabel: UILabel!

@IBOutlet weak var input_one: UITextField!


var convert : Double {

    get {

    return NSNumberFormatter().numberFromString(input_one.text!)!.doubleValue
    }
}


var convert_two :Double {

    get {

     return NSNumberFormatter().numberFromString(input_two.text!)!.doubleValue
    }
}


@IBAction func Addition(sender: AnyObject) {
   var Addition = convert + convert_two
    displaylabel.text = ("\(Addition)") // cast addition variable to string
}

@IBAction func Multiplication(sender: UIButton) {
    var Multiply = convert * convert_two
    displaylabel.text = ("\(Multiply)")
}


@IBAction func Subtraction(sender: AnyObject) {
    var Subtraction = convert - convert_two
    displaylabel.text = ("\(Subtraction)")
}

@IBAction func Division(sender:AnyObject )
{
    var Division = convert / convert_two
    displaylabel.text = ("\(Division)")

}

func clear_fields(){

    displaylabel.text = nil
    input_one.text = nil
    input_two.text = nil
}


@IBAction func Clear(sender: AnyObject) {
    clear_fields()
}

override func viewDidLoad() {
    super.viewDidLoad()

}

The code is basically taking both inputs and change it to Double then allow us to do any operation with them . Hope that helps