Swift decimal round. Is there something i've missed ? Rounds the value to an integral value using the specified rounding rule. 8) Which will return 1, as expected. When using Swift for macOS and iOS apps, round(_:) is a built-in function able to accept a Double or a Float. 0, Up: 4. Example rounding to . floor(_: ) and ceil(_: ) handle directional rounding. Here's my question: how do I round by thousandths in swift? I Rounding Numbers in Swift Rounding in Swift When using Swift for macOS and iOS apps, round (_:) is a built-in function able to accept a Double or a Float. Imagine we have a dashboard application that displays monthly tax on an employee’s salary. Rounding in binary is more efficient, but rounding in decimal is more useful for certain decimal-centric problems. But as a developer, we can’t use the same to… Rounding `Double` values to a specified number of decimal places (e. Let’s explore why that is, and what kind of tools and techniques that can be good to keep in mind when formatting different kinds of numbers. 5 and down when it's < . This tutorial will discuss how to write a Swift program to round a number to n decimal places. 001 To format a floating point number, rounded to a certain number of digits, use NSNumberFormatter as discussed by others. How can I round the result to 2 decimal places and show it on the result label? I found some statements, but I´m new to Swift and it is actually difficult for me to rebuild the samples for my proje The program works fine (all be it a little clunky - I'm new to swift!) but the result shows several figures after the decimal point so I've attempted to round it off to two decimal places. Round vs Floor vs Ceil: Swift In Swift, working with floating-point numbers often requires you to round values to their nearest whole number or perform specific types of rounding. 0 Regarding to that answer If you need to round to a specific place, then you multply by pow(10. 0, Decimal: 3. Swift’s Foundation framework offers comprehensive rounding functionality: round(_: ) is good old half-up rounding. g. 5 rounds down). 1915 I want to round this down to 3. 0 Deep Dive Historically, rounding is a mathematical concept predating computers, essential in commerce and science. It save time and helps to express long term into short term. Decimals worksheets from comparing and ordering decimals to rounding and operations with decimals. 1. 0:. round() always rounds up when the decimal place is >= . However if the result is less than 2 decimal places it Returns this value rounded to an integral value using the specified rounding rule. 0, number of places), round, and then divide by pow(10, number of places): Round to 2 decimal places: On a related point, how can you create a new type that stores dollars and cents as a floating point value with exactly 2 decimal places? If you do that, all this rounding becomes unnecessary. Relying on casting to NSDecimalNumber for that feels really ugly. The three The round() function returns a floating point number that is a rounded version of the specified number, with the specified number of decimals. The important thing is to understand your problem. 45599999999997952 Can't use Decimal (string:) because it has this unexpected and undocument… Learn how to truncate or round an NSNumber to one decimal place using Swift. But what about rounding a number to a specific number of decimal positions? Jan 3, 2026 · Rounding Double values to a specified number of decimal places (e. So my output is rounded up to 2 decimal places as expected. 142, Down: 3. A Little Hidden (For Me) Gem When Calculating Floating Points PS: Decimal the Floating Point directly might not work sometimes! Have you ever running into rounding errors when Hi, i was wondering why the Decimal swift type didn't have a rounded() function. 456214 -> 1456. I do not want to round the number t I want to round a double down to 1 decimal place. If you need to round to a specific place, then you multiply by pow(10. (As an aside, it's not accurate - what I mean is that if the score is 1 and the number of questions asked is 3, the above code displays the percentage as 33. The default number of decimals is 0, meaning that the function will return the nearest integer. I am new with swift and I need help. I am writing a Swift app and am dealing with decimals in a database (stored in mysql as decimals, with 2 digits. I would like to round the integer number to the nearest hundredth for currency purposes, How is it possible in Swift? Example: 1397968 becomes 1397900 Swift Decimal. Learn different methods to round double values to specific decimal places in Swift, including round(), string formatting, etc. If you need that level of precision, use fixed-point numbers instead. To round a value using the default “schoolbook rounding” of . 2 but I want to basi Below is how I would have previously truncated a float to two decimal places NSLog(@" %. Rounding a decimal number in Swift. This blog will break down **three methods** to round a `Double` to X decimal places in Swift, with a practical focus on converting seconds to hours. As described in this post, since Swift 3. 25 units) as well as rounding to nearest (snap a point to the nearest grid point). Learn Swift Language - Rounding Rounds the value to the nearest whole number with x. I’m writing something to store financial values and it should not be possible to store fractions of a cent, so every value should be x. $150. 02f %. Unlike rounding (which adjusts the last digit based on subsequent values), truncation **cuts off** digits after the desired decimal place without altering the remaining value. If a number is whole, which just ". 77, 89, 58. SwiftUI - Display Double rounded to 2 decimal places Asked 6 years, 3 months ago Modified 6 years, 3 months ago Viewed 29k times I have a really long decimal number (say 17. My attempt at rounding it to 2 decimal places is the Double(round(100*value)/100) and I have also tried to use the rounded() method which did not work. , 2 decimals for readability) is a critical skill. For example, truncating I am trying to round a number in swift, and I found a solution using this: func roundTo(number: Double, precision: Int) -> Double { var power: Double = 1 for _ in 1precision { In Swift, you can round a Double value to a specific number of decimal places using the round () function along with the pow () function. 3, but I digress) Truncating decimals to a specified number of places is a common task in programming—whether you’re working on financial apps, data analysis tools, or simply need to format numbers for display. 0 is now possible to round floating point numbers through new methods added to the Double and Float types. 0, Double (decimalPlaces)) return round (value * multiplier) / multiplier } // Example usage let Formatting numbers into human-readable strings can often be tricker than expected. 567 round(1. Sorry for the slight confusion, the Learn how to round a double to 3 decimal places in Swift without overriding the conversion method, ensuring accurate numerical representations in your applic Can't use literals (because Swift has only double precision floating point literals): let x = Decimal (123. (But I don’t generally recommend Decimal for money. But as a developer, we can’t use the same to display to users. 00 => 1. In this tutorial, Multiple ways to round a decimal (fractional) number of a double value using String format, NumberFormatter, NSDecimalNumber rounding method 3 Reference to the problem (to use String (format :) to round a decimal number) can be found in the answers (or more often comments) to these questions: Rounding a double value to x number of decimal places in swift and How to format a Double into Currency - Swift 3. Online calculator for rounding numbers showing the steps. To actually round the numbers (rather than just displaying it using a certain number of decimal places), you can use Decimal: BetOnline brings you the best in online sports betting providing latest and best odds on all sports. This is working well. toNearestOrAwayFromZero, you can use the shorter round() method instead. Bet with BetOnline Sportsbook today. Here's an example of how you can achieve this: func roundToDecimalPlaces (_ value: Double, _ decimalPlaces: Int) -> Double { let multiplier = pow (10. 94 without rounding the double to n Trying to figure out the 'correct' way to round down decimal numbers in Swift and struggling to set up the C calls correctly (or something) as it is returning a weird result. And it is coming as 630. 0" after it, I need to convert it to an integer, and if the number has digits after the decimal I would like to round a Double to a certain number of decimals always rounding down. For more information about the available rounding rules, see the FloatingPointRoundingRule enumeration. Swift provides the Decimal type for this purpose. My problem is that while I format my float number to add only two digits, this format is applying an automatic round of the last digit. The example of snapping to a 2D grid is a good one because it nicely demonstrates a lot of various related needs. round(3. 000) // 3 round(3. There is always some rounding. Normal rounding functions will round it to 3. 50000. 9384693864596069567) and I want to truncate the decimal to a few decimal places (so I want the output to be 17. Here's a snippet from In Swift, is there a way to truncate a float to 2 decimals, such that you can perform further calculations with it? All of the threads I've seen deal with casting to a string, which I can't figure If you need fraction precision don’t use floating point. 6152. In Swift, there are several ways to format decimal places, including using string interpolation, NSNumberFormatter, and the D In this tutorial I will explain how to round numbers to an integer and also a specified number of decimal places in swift. I want to get first two digits after the decimal point, for example - 1456. You can use floor() to force rounding down, and ceil() to force rounding up. xx I want this because for a Returns this value rounded to an integral value using the specified rounding rule. In your case the number of places is 2. Round numbers to thousands, hundreds, tens, ones, tenths, hundredths and thousandths. I am writing an app in swift and have used the below code . This does not have the representation problems that I described previously, but you have to keep track of the scale factor. 45 35629. 000 => 1. 5 (standard rounding). It can be used as below: round(0. I am new to Swift and am trying to make sure that yourShare only has 2 decimal places e. 788, 43. The end result is that this is pretty close to what I want. 56 rounding to . If you're working with computer graphics, you can go with Floats. Rounding a number means round a decimal number to a certain number of decimal places or we can say round to the nearest wholes, tenths, hundredths, or thousandth. The round function will round to the Rounding a Double value to a specific number of decimal places is a common task in Swift. 50, but at the moment it appears as $150. Mar 13, 2024 · Output: Standard: 3. 5 rounding up (but note that -x. The roundfunction will round to the nearest whole number: 40 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 Nov 4, 2025 · Explore expert methods for rounding Swift Doubles to exact decimal places using built-in functions, custom extensions, and formatting tools. For example if I have a double let val = 3. Swift has an specific type called Decimal exactly for this purpose Round up to n Decimal Digit: Swift We sometimes in our calculation get results with more than 4 decimal digits or even more. 0 instead of 33. How to round numbers and decimals. Master the art of `rounding decimals` in Swift by learning how to accurately round down a decimal to the nearest increment with this step-by-step guide. But without any round. However it does still display the percentage to 1 decimal place. 9384). 456) print (x) // 123. Explore methods for exact rounding and formatted display!---This video is based No number system is perfectly precise. Contribute to khawajafarooq/RoundingDecimal development by creating an account on GitHub. ---Th 1 This question already has answers here: Rounding a double value to x number of decimal places in swift (36 answers) We sometimes in our calculation get results with more than 4 decimal digits or even more. Round a digit upto two decimal place in Swift Asked 7 years ago Modified 6 years, 1 month ago Viewed 23k times In Swift, I need to be able to round numbers based on their value. If you're working with money or sensor data, you probably want Decimals. 02f", r, g, b); I checked the docs and the eBook but haven't been able to figure it out. Basically it's sales someone made each day, so generally anything from $0 to $1000, Format decimal to string in swift with correct rounding Asked 10 years, 4 months ago Modified 10 years, 4 months ago Viewed 1k times Flying High with Swift’s NumberFormatter: Tips, Tricks & Edge Cases You ever find yourself formatting numbers, thinking it’s going to be a smooth ride… and suddenly your loyalty points show 1 I have one float number initialized from a json server response like 65. There are various ways to achieve this, and the community has provided different solutions. The big question is whether you want the rounding to be in binary or decimal. 940812 -> 35629. xx with no trailing figures after the . For example rounding both up and down (enlarge a rect so that it snaps to the closest grid points, grid cell size being eg 0. 0, numberOfPlaces), round, and then divide by pow(10, numberOfPlaces). 60 With Swift 5, you can choose one of the 3 following paths in order to round up a CGFloat. This blog will break down three methods to round a Double to X decimal places in Swift, with a practical focus on converting seconds to hours. In programming, formatting numbers is an important task that helps to present data in a more readable and user-friendly way. 5679999 to 1. For example, rather than rounding to two decimal places, you can multiply by 100 and round to an integer. 5679999 * 100) This is sometimes a desirable solution. While playing around, I found the round() function in swift. 86985 … I need print this with only two decimals digits. fx4t, 68lsgd, vgy6f, duttd, bh1e, nnqki1, ksryh, mobiy6, ps4pk, 2a4or,