#include <stdio.h>
#include <iostream.h>
#include "Stack1.h"
   stack::stack()  {
        stack_ptr = new int [100]; //constructor
        max_len = 99;
        top_ptr = -1;
      }
   stack::~stack() {delete [] stack_ptr;} //destructor
   void stack::push (int number) {
         if (top_ptr == max_len)
            cout << "error stack is full\n";
         else stack_ptr[++top_ptr] = number;
      }
   int stack::pop() {
         if (top_ptr == -1)
           { cout << "error stack is empty\n";
            return 0;}
         else return (stack_ptr[top_ptr--]);
      }
   int stack::top() {return (stack_ptr[top_ptr]);}
   int stack::empty() {return (top_ptr == -1);}