import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var number1TextField: UITextField!
    @IBOutlet weak var number2TextField: UITextField!
    @IBOutlet weak var resultLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func calculateButtonTapped(_ sender: UIButton) {
        guard let number1Text = number1TextField.text, let number2Text = number2TextField.text else {
            return
        }

        guard let number1 = Int(number1Text), let number2 = Int(number2Text) else {
            resultLabel.text = "Invalid input"
            return
        }

        var result: Int?
        switch sender.tag {
        case 0: // Addition
            result = number1 + number2
        case 1: // Subtraction
            result = number1 - number2
        case 2: // Multiplication
            result = number1 * number2
        case 3: // Division
            if number2 != 0 {
                result = number1 / number2
            } else {
                resultLabel.text = "Cannot divide by zero"
            }
        default:
            break
        }

        if let resultValue = result {
            resultLabel.text = String(resultValue)
        }
    }
}