Implement queue using two stack in cpp

	#include< iostream > #include< stack >
	using namespace std;
	stack<int> s1, s2;
	void enqueue(int data)
	{
	while(!s1.empty()) {
	s2.push(s1.top());
	s1.pop();
	}
	s1.push(data);
	while(!s2.empty()) {
	s1.push(s2.top());
	s2.pop();
	}
	}
	void dequeue()
	{
	if(!s1.empty()) {
	s1.pop();
	}
	}
	int front()
	{
	return s1.top();
	}
	bool isEmpty()
	{
	return s1.size() == 0;
	}
	int size()
	{
	return s1.size();
	}
	void printData()
	{
	while(!s1.empty()) {
	cout << s1.top() << " ";
	s1.pop();
	}
	cout << endl;
	}
	int main()
	{
	int n, m, k;
	cin >> n;
	for(int i = 0; i < n; i++) {
	cin >> k;
	enqueue(k);
	}
	cout << "Queue is empty : " << (isEmpty()?"True":"False") << endl;
	cout << "Queue front element : " << front() << endl;
	dequeue();
	cout << "Queue size : " << size() << endl;
	enqueue(12);
	enqueue(6);
	cout << "Queue new size : " << size() << endl;
	cout << "Queue new element are : ";
	printData();
	cout << "Queue is empty : " << (isEmpty()?"True":"False") << endl;
	return 0;
	}