# init(exactly:) Creates an integer from the given floating-point value, if it can be represented exactly. ``` init?(exactly source: Float) ``` ## Parameters `source` A floating-point value to convert to an integer. ## Discussion If the value passed as `source` is not representable exactly, the result is `nil`. In the following example, the constant `x` is successfully created from a value of `21.0`, while the attempt to initialize the constant `y` from `21.5` fails: ``` let x = Int(exactly: 21.0) // x == Optional(21) let y = Int(exactly: 21.5) // y == nil ``` --- 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)