## 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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Double, Floating-point to integer conversion must also be made explicit. An integer type can be initialized with a Double or Float value: let� Java Convert int to double. We can convert int to double in java using assignment operator. There is nothing to do extra because lower type can be converted to higher type implicitly. It is also known as implicit type casting or type promotion. Java int to double Example. Let's see the simple code to convert int to double in java.

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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?