strcmp() - determines the lexical relationship between two strings.
int strcmp( string one, string two );
This implementation of strcmp() is identical to the one found in C libraries. If string one lexically precedes string two, then strcmp() returns a number less than 0. If the two strings have the same value, strcmp() returns 0. If string two lexically precedes string one, then strcmp() returns a number greater than 0. This efunction is particu‐ larly useful in the compare functions needed by sort_array(3).