C++_(for Nig**)_2

#include <iostream>
#include "Stack.h"
#include <fstream>
using namespace std;




int main()
{
    ifstream in("input.txt");
    ofstream out("output.txt");
    Stack <int> s1;
    int n;
    cin >> n;

    while (in >> n)
    {
        s1.Push(n);
    }



    while (!s1.Empty())
    {
        if (s1.Top() % 2 == 0)
    {
            int j = s1.Top() * 2;
            s1.Pop();
            s1.Push(j);
    }
        out << s1.Top() << " ";
        s1.Pop();
    }

    in.close();
    out.close();
    return 0;
}

/*********************STACK.h****************************************/

using namespace std;

template <class Item>
class Stack
{
private:
    struct Element
    {
        Item inf;
        Element *next;
        Element(Item x, Element *p) : inf(x), next(p) {}
    };
    Element *head;
public:
    Stack() : head(0) {}

    bool Empty()
    {
        return head == 0;
    }

    Item Pop()
    {
        if (Empty())
        {
            return 0;
        }
        else
        {
            Element *r = head;
            Item i = r->inf;
            head = r->next;
            delete r;
            return i;
        }
    }
    void Push(Item data)
    {
        head = new Element(data, head);
    }
    Item Top()
    {
        if (Empty())
        {
            return 0;
        }
        else
        {
            return head->inf;
        }
    }
};
/**************************************************************************/