rem: memset (in_set, 0, N_CHARS * sizeof (in_set[0]));
add: memset (in_set, 0, sizeof in_set);
context: card_of_complement (struct Spec_list *s){  int c;  int cardinality = N_CHARS;  SET_TYPE in_set[N_CHARS];  memset (in_set, 0, N_CHARS * sizeof (in_set[0]));  s->state = BEGIN_STATE;  while ((c = get_next (s, NULL)) != -1)    if (!in_set[c]++)      --cardinality;  return cardinality;}