TestIOS

//https://vk.com/evgenykravchenko0

                ___                                        ___                   ___
               /  /\                  ___                 /  /\                 /  /\
              /  /:/_                /__/\               /  /:/_               /  /:/_
             /  /:/ /\               \  \:\             /  /:/ /\             /  /:/ /\
            /  /:/ /:/_               \  \:\           /  /:/_/::\           /  /:/ /:/_
           /__/:/ /:/ /\          ___  \__\:\         /__/:/__\/\:\         /__/:/ /:/ /\
           \  \:\/:/ /:/         /__/\ |  |:|         \  \:\ /~~/:/         \  \:\/:/ /:/
            \  \::/ /:/          \  \:\|  |:|          \  \:\  /:/           \  \::/ /:/
             \  \:\/:/            \  \:\__|:|           \  \:\/:/             \  \:\/:/
              \  \::/              \__\::::/             \  \::/               \  \::/
               \__\/                   ~~~~               \__\/                 \__\/
                            ___
                           /__/\                ___                 ___
                           \  \:\              /  /\               /  /\
                            \  \:\            /  /:/              /  /:/
                        _____\__\:\          /__/::\             /__/::\
                       /__/::::::::\         \__\/\:\__          \__\/\:\__
                       \  \:\~~\~~\/            \  \:\/\            \  \:\/\
                        \  \:\  ~~~              \__\::/             \__\::/
                         \  \:\                  /__/:/              /__/:/
                          \  \:\                 \__\/               \__\/
                           \__\/
import UIKit

class ViewController: UIViewController {
    var numberFromScreen: Double = 0
    var firstNum: Double         = 0
    var mathSign: Bool           = false
    var operation:Int            = 0

    @IBOutlet weak var result: UILabel!

    @IBOutlet weak var button: UIButton!

    @IBAction func digits(_ sender: UIButton) {

        if  mathSign {
            result.text = String(sender.tag)
            mathSign = !mathSign
        }
        else {
            result.text = result.text! + String(sender.tag)
        }
        numberFromScreen = Double(result.text!)!
    }

    @IBAction func buttonsOperation(_ sender: UIButton) {
        if result.text != "" && sender.tag != 10 && sender.tag != 15 {
            firstNum = Double(result.text!)!

            operation = sender.tag
            mathSign  = true
        }
        else if sender.tag == 15 {
            switch operation {
            case 11:
                result.text = String(firstNum / numberFromScreen)
                break
            case 12:
                result.text = String(firstNum * numberFromScreen)
                break
            case 13:
                result.text = String(firstNum - numberFromScreen)
                break
            case 14:
                result.text = String(firstNum + numberFromScreen)
                break
            case 17:
                result.text = String(firstNum);
                break
            default:
                break
            }
        }
        else if sender.tag == 10 {
            result.text      = ""
            firstNum         = 0
            numberFromScreen = 0
            operation        = 0
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        //button.layer.cornerRadius = 47
        // Do any additional setup after loading the view.
    }


}