#include
using namespace std;
#include )
class Stack{
protected:
enum { MAX = 3 };
int st[MAX];
int top;
public:
Stack()
{ top = -1; }
void push(int var)
{ st[++top] = var; }
int pop()
{ return st[top--]; }
};
class Stack2 : public Stack
{
public:
void push(int var)
{
if(top >= MAX-1)
{ cout << "\nError: stack is full"; exit(1); }
Stack::push(var);
}
int pop()
{
if(top < 0)
{ cout << "\nError: stack is empty\n"; exit(1); }
return Stack::pop();
}
};
int main()
{
Stack2 s1;
s1.push(11);
s1.push(22);
s1.push(33);
cout << endl << s1.pop();
cout << endl << s1.pop();
cout << endl << s1.pop();
cout << endl;
return 0;
}