стек

#include "exception.cpp"
#include <iostream>
#include <fstream>

using namespace std;

template <class X>
class Stack
{
    struct Element
    {
        X inf;
        Element *next;
        Element (X x, Element *p): inf(x), next(p)
        {
        }
    };
    Element *head;
public:
    Stack():head(0)
    {
    }
    bool Empty()
    {
        return head == 0;
    }
    X Pop()
    {
        if (Empty())
        {
            throw StackException("StackException: Pop - стек пуст");
        }
        else
        {
            Element *r = head;
            X i = r->inf;
            head = r->next;
            delete r;
            return i;
        }
    }
    void Push(X data)
    {
        head = new Element(data, head);
    }
    X Top()
    {
        if (Empty())
        {
            throw StackException("StackException: Top - стек пуст");
        }
        else
        {
            return head->inf;
        }
    }
};

int main()
{
    Stack <int> t, t1;
    int i;
    ifstream in ("input.txt");
    ofstream out ("output.txt");
    while (in >> i)
    {
        t.Push (i);
    }
    in.close();
    while(!t.Empty())
    {
        i = t.Pop();
        if(i%2 == 0) t1.Push(2*i);
        else t1.Push(i);
    }
    while (!t1.Empty())
    {
        out << t1.Pop() << " ";
    }
    out.close();
    return 0;
}
//срр
#include <exception>
#include <string>

using namespace std;

class StackException: public exception
{
public:
    StackException(const string & message=""): exception(message.c_str())
    {
    }
};