strncmp

   Compares not more than maxchar characters of two ASCII character
   strings and returns a negative, 0, or positive integer,
   indicating that the ASCII values of the individual characters
   in the first string are less than, equal to, or greater than the
   values in the second string.

   Format

     #include  <string.h>

     int strncmp  (const char *str_1, const char *str_2, size_t    
                  maxchar);
 

Additional information available:

Arguments       Description     Return_Values   Examples