Question

What is the output from running the following code snippet.

void mystery(Queue<int>& q)
{
Stack<int> s;

while (!s.isEmptyQueue())
{
s.push(q.front());
q.deleteQueue();
}

while (!s.isEmptyStack())
{
q.addQueue(2 * s.top());
s.pop();
}
}

Queue q;
q.addQueue(8);
q.addQueue(4);
q.addQueue(18);
q.addQueue(7);
q.addQueue(5);

mystery(q);

cout << "[";
while (!.isEmptyQueue())
{
cout << " " << q.front();
}
cout << " ]" << endl;

Answer 1

mystery function reverses the elements in Queue and doubles every value.

Output:
---------
[ 10 10 10 10 10 ... forever
because there is am infinite loop in
while (!.isEmptyQueue())
{
    cout << " " << q.front();
}

If this infinite loop is ignored then output is

[ 10 14 36 8 16 ]