strncmp---character string compare#include <string.h> int strncmp(const char *a, const char * b, size_t length);Description
strncmp compares up to length characters
from the string at a to the string at b.
Returns
If *a sorts lexicographically after *b,
strncmp returns a number greater than zero. If the two
strings are equivalent, strncmp returns zero. If *a
sorts lexicographically before *b, strncmp returns a
number less than zero.
Portability
strncmp is ANSI C.
strncmp requires no supporting OS subroutines.