Лабораторные / Стек

#include <iostream>
using namespace std;
Node* top = NULL;
struct Node
{
	Node(int n)
	{
		count = n;
		next = 0;
	}
	Node(int n, Node* p){
		count = n;
		next = p;
	}
	int count;
	Node* next;
};
void push(int N)
{
	Node* p;
	if (top){
		p = new Node(N, top);
		top = p;
	}
	else{
		top = new Node(N);
	}
};
int pop()
{
	int c;
	c = top->count;
	Node* p = top;
	top = top->next;
	delete p;
	return c;
};
void print()
{
	Node* p = top;

	while (p != 0){
		cout << p->count << " ";
		p = p->next;
	}
	cout << ".\n";
};
int main()
{
	int menu;
	while (1)
	{
		cout << "Menu:\n1.Push element; \n2.Pop element; \n3.Vivesti ves' stack; \n.0.Exit.";
		cin >> menu;
		switch (menu)
		{
		case 1:
		{
			cout << "Vvedite znachenie";
			cin >> n;
			push(n);
			system("cls");
			break;
		}
		case 2:
		{
			push();
			system("pause");
			system("cls");
			break;
		}
		case 3:
		{
			print();
			system("pause");
			system("cls");
			break;
		}
		case 0:
		{
			exit();
		}
		default:
		{
			cout << "Vvedite zanovo";
			system("cls");
			break;
		}
		}
	}
	return 0;
}