/* ``Starts'' a timer by recording the current time in |*t|. */
static void
start_timer (clock_t *t)
{
  clock_t now = clock ();
  while (now == clock ())
    /* Do nothing. */;
  *t = clock ();
}

/* Prints the elapsed time since |start|, set by |start_timer()|. */
static void
stop_timer (clock_t start)
{
  clock_t end = clock ();

  printf ("%.2f seconds\n", ((double) (end - start)) / CLOCKS_PER_SEC);
}