The strncmp function compares the first len bytes of string1 and string2 and returns a value indicating their relationship.

The strncmp function returns the following values to indicate the relationship of the first len bytes of string1 to string2:

memcmp, strcmp

#include <string.h>
#include <stdio.h> /* for printf */

void tst_strncmp (void) {
  unsigned char str1 [] = "Wrodanahan T.J.";
  unsigned char str2 [] = "Wrodanaugh J.W.";
  char i;

  i = strncmp (str1, str2, 15);

  if (i < 0)
    printf ("str1 < str2\n");
  else if (i > 0)
    printf ("str1 > str2\n");
  else
    printf ("str1 == str2\n");
}