# scanUnsignedLongLong(_:) Scans for an unsigned long long value from a decimal representation, returning a found value by reference. ``` func scanUnsignedLongLong(_ result: UnsafeMutablePointer?) -> Bool ``` ## Parameters `result` Upon return, contains the scanned value. Contains `ULLONG_MAX` on overflow. ## Return Value if the receiver finds a valid decimal integer representation, otherwise . Overflow is considered a valid decimal integer representation. ## Discussion All overflow digits are skipped. Skips past excess digits in the case of overflow, so the receiver’s position is past the entire decimal representation. Invoke this method with `NULL` as `unsignedLongLongValue` to simply scan past an unsigned long decimal integer representation. --- 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)