# sign(strategy:) Modifies the format style to use the specified sign display strategy for displaying or omitting sign symbols. ``` func sign(strategy: Decimal.FormatStyle.Configuration.SignDisplayStrategy) -> Decimal.FormatStyle ``` ## Parameters `strategy` The sign display strategy to apply to the format style, such as [`automatic`](/documentation/Foundation/NumberFormatStyleConfiguration/SignDisplayStrategy/automatic) or [`never`](/documentation/Foundation/NumberFormatStyleConfiguration/SignDisplayStrategy/never). ## Return Value A decimal format style modified to use the specified sign display strategy. ## Discussion The following example creates a default [`Decimal.FormatStyle`](/documentation/Foundation/Decimal/FormatStyle) for the `en_US` locale, and a second style that displays a sign for all values except zero. It then applies each style to an array of decimal values. The formatting that the modified style applies adds the negative (`-`) or positive (`+`) sign to all the numbers. ```swift let defaultStyle = FloatingPointFormatStyle(locale: Locale(identifier: "en_US")) let alwaysStyle = defaultStyle.sign(strategy: .always(includingZero: false)) let nums = [-2.1, -1.2, 0, 1.4, 2.5] let defaultNums = nums.map { defaultStyle.format($0) } // ["-2.1", "-1.2", "0", "1.4", "2.5"] let alwaysNums = nums.map { alwaysStyle.format($0) } // ["-2.1", "-1.2", "0", "+1.4", "+2.5"] ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)