#include <iostream>
#include <cstdlib>
#include <stack>   //for class stack
#include <string>  //for class string
using namespace std;

int main()
{
	stack<int> s;   //The fill name of this data type is std::stack<int>

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

	cout << s.top() << "\n";  //Output the most recently pushed it.
	s.pop();                  //Remove the most recently pushed item.
	cout << s.top() << "\n";
	s.pop();
	cout << s.top() << "\n";
	s.pop();

	struct person {
		string firstname;
		string lastname;
	};

	person a[] {
		{"George", "Washington"},
		{"John",   "Adams"},
		{"Thomas", "Jefferson"}
	};
	const size_t n {size(a)};  //the number of elements in the array

	stack<person> t;

	for (int i {0}; i < n; ++i) {
		t.push(a[i]);
	}

	for (int i {0}; i < n; ++i) {
		person p {t.top()};
		t.pop();
		cout << p.firstname << " " << p.lastname << "\n";
	}
	
	return EXIT_SUCCESS;
}