#include <cstdlib>
#include <iostream>
//#include <process.h>

using namespace std;
class stack
{
      protected:
                int st[3];
                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>=3-1)
             {cout<<"\nError: Stack is full";
             }
             stack::push(var);
             }
             int pop()
             {if (top<0)
             {cout<<"\nError:Stack is empty";
             }
             return stack::pop();
             }
             };
             


int main(int argc, char *argv[])
{ 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;
    system("PAUSE");
    return EXIT_SUCCESS;
}