# init(_:) Creates an integer from the given floating-point value, rounding toward zero. ``` init(_ source: Double) ``` ## Parameters `source` A floating-point value to convert to an integer. `source` must be representable in this type after rounding toward zero. ## Discussion Any fractional part of the value passed as `source` is removed, rounding the value toward zero. ``` let x = Int(21.5) // x == 21 let y = Int(-21.5) // y == -21 ``` If `source` is outside the bounds of this type after rounding toward zero, a runtime error may occur. ``` let z = UInt(-21.5) // Error: ...the result would be less than UInt.min ``` --- 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)