Double has a precision of at least 15 decimal digits, whereas the precision of Float can be as little as 6 decimal digits. In Swift 4 you get native String support for working with different numeric types (Float, Double, and Int). Double, are unable to exactly represent many decimal numbers. This example has been tested in xcode 8.2 using swift 3.0.1 on Macbook pro running macOS Sierra. How to get overall CPU usage in iOS Swift 4.x, Get CPU usage percentage of single iOS App in Swift 4.x, Get the currently connected WiFi informations in Swift 4.x, Check connection from iOS device to server by Swift 4.X, Get the server’s current time with Swift 4.X URLSession, Write a log text file on Disk use TextOutputStream in Swift 4 iOS. Solving the decimal problem. Finally, Swift offers two floating-point types which differ in size and in precision of their fractional component: Float (size: 32-bit, precision: ≥6 decimal digits) Double (size: 64-bit, precision: ≥15 decimal digits) #Numeric Literals. @IBOutlet weak var numberOfPeopleTextField: UITextField! But that's not the end of the story, you may need to use the NumberFormatter (NSNumberFormatter) class to convert formatted numbers (1,000,000) or currency ($3.50) in your Swift … The "%f" format string means "a floating point number," but "%.2f" means "a floating-point number with two digits after the decimal point. let a = String (42) // "42" let b = String (3.14) // "3.14" let c = " \(42), \(3.14) " // "42, 3.14". Download iWork for Free Officially (Pages, Keynote, numbers), Quit Cocoa App when Window Close using XCode Swift 3, Codeigniter 404 error on inner pages [solved], How to add javascript file in WordPress shortcode. Decimal to Double calculator. iOS13 Navigation bar large titles not covering status bar. swift: issue in converting string to double, Swift uses the IEEE 754 standard for representing single- and double-precision floating point numbers, and if you assign let x = 8.7. then the Swift 4.2+ String to Double. Solution that works in Swift 4. let double = 3.14 let decimal = Decimal(double) let doubleFromDecimal = NSDecimalNumber(decimal: decimal).doubleValue print(doubleFromDecimal) Rounding a Double in swift is quite simple and easy (tested up to swift 5.1). E.g. if we need 3 digits after the decimal point, then we will multiply and divide by 1000. share. It doesn’t show up when you go via a string because the double-to-string code rounds the value. The appropriate floating-point type to use depends on the nature and range of values you need to work with in your code. The example below will demonstrate how to use this function effectively, while keeping your number still a Double (without changing the type). Swift has these different numerical types because they store their data differently. stores in x an approximation of 0.7, because that number cannot. Rounding a Double in swift is quite simple and easy (tested up to swift 5.1). Double has a precision of at least 15 decimal digits, whereas the precision of Float can be as little as 6 decimal digits. We simply need to use the round() function provided by swift. Xcode 11.3 • Swift 5.1 or later CC BY-SA 3.0. GitHub Gist: instantly share code, notes, and snippets. You should use a floating-point type in Swift programs whenever you need a number with a decimal, such as 24.02 or 3.25. If you have an integer hiding inside a string, you can convertby using the integer’s constructor, like this: let myInt = Int(textField.text) As with other data types (Float and Double) you can also convert by using NSString: let myString = "556" let myInt = (myString as NSString).integerValue Floating-point types can represent a much wider range of values than integer types, and can store numbers that […] If you are using JSONDecoder, you might prefer to use a Double rather than a Decimal as the decoded type even if you want the end result to be a Decimal, and do the conversion yourself, possibly via a String. The example below will demonstrate how to use this function effectively, while keeping your number still a Double (without changing the type). or when you use String format use 0 instead of 1: String(format: "%.0f", yourDoubleValue) this will just display your Double value with no decimal places, without converted it to int. Then inside that function we simply multiplied our variable with 100. Adding to above answer if we want to format Double multiple times, we can use protocol extension of Double like below: Remove all non-numeric characters from a string in swift, Adding a view controller as a subview in another view controller. In some cases, however, the API is already a fact. Tip: We need to add as many zeros to 1 while multiplying and dividing, as many digits we want after the decimal point in our Double. Simple to use Extension:-. In situations where either type would be appropriate, Double is preferred. Tuesday, October 11, 2016. iOS Swift. Updated to SWIFT 4 and the proper answer for the question If you want to round up to 2 decimal places you should multiply with 100 then round it off and then divide by 100 var x = 1.5657676754 var y = (x*100).rounded()/100 print(y) // 1.57 init(Double) Creates and initializes a decimal with the provided floating point value. print(String(format:"%a", x)) // 0x1.6666666666666p-1. From. – Sulthan Aug 10 '17 at 10:06 decimal to string or string to decimal – Subhojit Mandal Aug 10 '17 at 10:26 How to convert double to int in swift So I'm trying to figure out how I can get my program to lose the .0 after an integer when I don't need the any decimal places. @IBOutlet weak var amountOfTurkeyLabel: UILabel! The code for float to string with specific digits after decimals is: Here the %.2f tells the swift to make this number rounded to 2 decimal places. You should use the new type initializers to convert between String and numeric types (Double, Float, Int). 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