???? for ?(vector < int > ::iterator?iter? = ?vi.begin();
????????iter? != ?vi.end();
???????? ++ iter)
???????? {
????????????cout? << ? * iter? << ?endl;
????????}

???????? // 下面利用copy來實現
????copy(vi.begin(),?vi.end(),?ostream_iterator < int > (cout,? " \n " ));