title: Is it necessary to set variable 'possibleIntegerValue' to 'optional Int(Int?)' or it is ok to set 'possibleIntegerValue' to the type 'Int' instead?
body: <p>I'm new to Swift and is trying to learn the concept of optional values. My question is, within the context of the code before, is necessary to set variable 'possibleIntegerValue' to 'optional Int(Int?)' or it is ok to omit the <code>?</code> sign and set 'possibleIntegerValue' to the type 'Int' instead?</p>
  
  <p>What kind of impact doesit make if I indeed change the type from optional Int to Int? </p>
  
  <pre><code>let numberSymbol: Character = "三"  // Simplified Chinese for the number 3
  var possibleIntegerValue: Int?
  switch numberSymbol {
  case "1", "١", "一", "๑":
      possibleIntegerValue = 1
  case "2", "٢", "二", "๒":
      possibleIntegerValue = 2
  case "3", "٣", "三", "๓":
      possibleIntegerValue = 3
  case "4", "٤", "四", "๔":
      possibleIntegerValue = 4
  default:
      break
  }
  if let integerValue = possibleIntegerValue {
      print("The integer value of \(numberSymbol) is \(integerValue).")
  } else {
      print("An integer value could not be found for \(numberSymbol).")
  }
  </code></pre>