#include <vector>

using namespace std;

// stack of integers

class iStack {
  int _top;
  int _capacity;
  vector<int> _stack;
  
 public:
 iStack(int capacity) : _top(0), _capacity(capacity), _stack(capacity) { /* do nothing */ }
  
  void pop(int &top_value);
  void push(int value);

  bool full();
  bool empty();
  void display();

  int size();

};