#include <assert.h>
#include <iostream.h>

class int_stack {
	int sz;
	int top;
	int* stack;
public:
	
	int_stack (int );		// specified size
	int_stack ();		// default size
	~int_stack ();
	void push(int );
	int pop();
	bool isempty();
	bool isfull();
};