| http://www.w3.org/ns/prov#value | - The function shall return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second. ?? If two elements compare as equal, their order in the sorted array is unspecified. qsort executes a binary-search operation on a pre-sorted array ?? ?? base ?? nelem ?? size ?? 3-104 key is a pointer to the element
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