exit (dir == NULL ? EXIT_FAILURE : EXIT_SUCCESS);
return (dir == NULL ? EXIT_FAILURE : EXIT_SUCCESS);
main (void){  char *dir;  /* Let this program be used for debugging.  */  mtrace ();  dir = getcwd ((char *) NULL, 0);  if (dir == NULL)    perror ("getcwd");  else    {      puts (dir);      free (dir);    }  exit (dir == NULL ? EXIT_FAILURE : EXIT_SUCCESS);}