Compares two strings.
#include <string.h> int strcmp ( const char *s1, const char *s2);
(IN) Points to a null-terminated string to compare.
(IN) Points to a null-terminated string to compare.
Returns 0 if the two strings match. Otherwise, it returns an integer less than or greater than 0, depending on whether s1 is lexicographically less than or greater than s2.