STACK

#include <iostream>
#include <string>
using namespace std;
struct stack
{
    int inf;
    struct stack *next; // указатель на следующий элемент стека
};
void push(stack * &NEXT, int INF)
{
    stack *new_element = new stack;
    new_element->inf = INF;
    new_element->next = NEXT;
    NEXT = new_element;
}
int pop(stack * &NEXT)
{
    int temp = NEXT->inf;
    stack *MyStack = NEXT;
    NEXT = NEXT->next;
    delete MyStack;
    return temp;
}
int main()
{
    stack *Mystack = 0; // указатель на вершину стека
    int a = 0, k = 0;
    string answer;
    cout << "Do I add an element to the stack? Answer YES or NO: " ;
    cin >> answer;
    while (answer == "YES" )
    {
        k++;
        cout << "Enter your element: " << endl;
        cin >> a;
        push(Mystack,a);
        cout << "Another one? ";
        cin >> answer;
    }
    cout << "This is your stack: ";
    while (k != 0)
    {
        cout << pop(Mystack) << " ";
        k--;
    }

    return 0;
}