411 REFERENCE · Wikibooks
C++ Language/Std/CRuntime/BasicAlgorithms/Search
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
The C-Runtime's basic implementation of linear search by _lfind() will return NULL if the key does not already exist.
Binary search by bsearch() expects the input to be both sorted and unique.
Additional information about C-Runtime's search functions (includes interactive examples)