阅读以下代码，下面哪一项是正确的？(    )

void processData() {

      stack<int> s;

      queue<int> q;

      for (int i = 1; i <= 5; ++i) {

            s.push(i);

            q.push(i);

      }

      while (!s.empty()) {

            cout << "Stack pop: " << s.top() << endl;

            s.pop();

      }

      while (!q.empty()) {

            cout << "Queue pop: " << q.front() << endl;

            q.pop();

      }

}