# show(length:rounded:increment:) Creates a display strategy that shows a fractional part. ``` static func show(length: Int, rounded rule: FloatingPointRoundingRule = .toNearestOrEven, increment: Double? = nil) -> Duration.UnitsFormatStyle.FractionalPartDisplayStrategy ``` ## Parameters `length` The maximum string length of the fractional part. `rule` A rule for rounding fractional values up or down. Defaults to [`FloatingPointRoundingRule.toNearestOrEven`](/documentation/Swift/FloatingPointRoundingRule/toNearestOrEven). `increment` A multiple by which the formatter rounds the fractional part. The formatter produces a value that is an even multiple of this increment. If this parameter is `nil` (the default), the formatter doesn’t apply an increment. This value is only meaningful when the combination of allowed units, rounding rule, and formatting strategy requires expressing a unit with a fractional part. For example, a formatter that only allows minutes and uses a strategy with a length of `2` and default rounding rule formats 40 seconds as `0.67 minutes`. With a `increment` of `0.05`, the formatter formats this value as `0.65 minutes` instead. --- 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)