#include <iostream>
#include <cstdlib>
#include <stack>
using namespace std;

int main()
{
	stack<int> s;   //Born empty because we gave no args to constructor.

	cout << "empty == " << s.empty() << ", size == " << s.size() << "\n";

	s.push(10);
	s.push(20);
	s.push(30);

	cout << "empty == " << s.empty() << ", size == " << s.size() << "\n";

	cout << s.top() << "\n";
	s.pop();   //returns void, unlike the stack::pop we wrote

	cout << s.top() << "\n";
	s.pop();

	cout << s.top() << "\n";
	s.pop();

	cout << "empty == " << s.empty() << ", size == " << s.size() << "\n";
	return EXIT_SUCCESS;
}