20011109-2.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

int main(void)
{
  char *c1 = "foo";
  char *c2 = "foo";
  int i;
  for (i = 0; i < 3; i++)
    if (c1[i] != c2[i])
      abort ();
  exit (0);
}