#include <iostream>
#include <cstdlib>
using namespace std;
#include "stack.h"

int main()
{
	cout << "To hire a person, type their social security number.\n"
		"To fire the most recently hired person, type a zero.\n"
		"To quit, type control-d.\n\n";

	for (stack s;;) {        //Keep s alive as long as we're in the loop.
		int ss {0};      //social security number
		cin >> ss;

		if (!cin) {      //The user typed control-d
			break;   //out of the for loop
		}

		if (ss > 0) {    //hire
			s.push(ss);
		} else {         //fire
			cout << "Firing number " << s.pop() << ".\n";
		}
	}

	//Destruct s at this point.

	return EXIT_SUCCESS;
}