# init(nan:signaling:) Creates a NaN (“not a number”) value with the specified payload. ``` init(nan payload: Float.RawSignificand, signaling: Bool) ``` ## Parameters `payload` The payload to use for the new NaN value. `signaling` Pass `true` to create a signaling NaN or `false` to create a quiet NaN. ## Discussion NaN values compare not equal to every value, including themselves. Most operations with a NaN operand produce a NaN result. Don’t use the equal-to operator (`==`) to test whether a value is NaN. Instead, use the value’s `isNaN` property. ``` let x = Float(nan: 0, signaling: false) print(x == .nan) // Prints "false" print(x.isNaN) // Prints "true" ``` --- 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)