預期宣言錯誤

我的問題是，我試圖做一個計算器，但我沒有這樣做，因爲預期的聲明問題。我審查了有關預期申報的其他問題，但我沒有解決這個問題。預期宣言錯誤

import UIKit 

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) { 
     let 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 = Int(Screen.text!)! 
     operation = sender.currentTitle!! 

    } 

    @IBAction func equals(sender: AnyObject) { 
     secondNumber = Int(Screen.text!)! 
     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)" 

     func clear(sender: AnyObject) { 
      firstNumber = 0 
      secondNumber = 0 
      isTypingNumber = false 
      result = 0 
      Screen.text = "\(result)" 

     } 





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

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

}

來源

2016-01-19 B.K

'變種X = INT（）'是錯誤的....它看起來像這樣：'VAR firstNumber：詮釋？' The？使var可選，所以它可以爲零。如果你不把它設置爲可選的，你必須在聲明它的同時設置變量。 'var no可選：Int = 0' – Godlike

@實際上''var x = Int（）''會編譯，它會將x初始化爲0。 – JAL

@JAL真的嗎？哦，我測試了它，你是對的。所以它必須是。否則 – Godlike

你缺少一個右括號在equals功能：

@IBAction func equals(sender: AnyObject) { 
    secondNumber = Int(Screen.text!)! 
    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)" 
} // missing this

來源

2016-01-19 13:14:30 JAL

預期宣言錯誤

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