Convert Int to Double in Swift

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label.text = String(format:"%.1f hour", theOrder.bookingMins/60.0)

The above code just get the error:'Int' is not convertible to 'Double'

bookingMins is of type Int, so how do I convert an Int to a Double in Swift? Seems not as simple as in C.

Try Double(theOrder.bookingMins)

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What I prefer to do is to use computed properties. So I like to create an extension of Double and than add a property like below:

extension Int {
  var doubleValue: Double {
    return Double(self)
  }
}

And than you can use it in very Swifty way, I believe in future updates of swift language will be something similar.

let bookingMinutes = theOrder.bookingMins.doubleValue

in your case

label.text = String(format: "%.1f hour", bookingMinutes / 60.0) 

Style guide used: https://github.com/raywenderlich/swift-style-guide

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label.text = String(format:"%.1f hour", Double(theOrder.bookingMins) /60.0)

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Swift 4/5

let mins = Double(theOrder.bookingMins)
label.text = String(format:"%.1f hour", mins/60.0)

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Comments
  • This is documented behaviour of the Swift programming language to avoid hidden conversion errors. I would recommend to read the chapter "Numeric Type Conversion" in the Swift reference book.
  • Double(theOrder.bookingMins!)/60.0 solve the problem. strange!
  • @shadox: If this answer solved your problem (and it sounds like it did; this is the correct way to convert an Int to a Double), please accept the answer. Thanks.
  • @DarkDust sorry,When I want to accept the answer. It had not been 6 mins since I ask the question....
  • That's because the problem was with bookingMins. That's why I told you to use Double(theOrder.bookingMins).
  • @shadow: Double(theOrder.bookingMins/60.0) doesn't work since bookingMins is an Int, but you're trying to divide it by a double (60.0). You first have to convert bookingMins via Double(theOrder.bookingMins), then you can divide by 60.0 since only then both are of the same type.
  • What is the real difference between this answer and the already existing answers?