// We append three files here.  You should separate them and use them.
// You should implement the majority of these methods
// plus others if you find necessary.
// The code represents the correct structure and we should use it
// you may need to check the correctness though.
// If you  think you should implement it in a different way
// you should write it in your report and explain why.
// Michalis

// ----------- global.h --------------
#include <iostream.h>
#include <stdio.h>
#include <string.h>
#include <fstream.h>
#include <stdlib.h>

#define NOOP 0
#define MIN -1
#define MAX -2
#define AVG -3
#define min(a, b)  (((a) < (b)) ? (a) : (b)) 
#define max(a, b)  (((a) > (b)) ? (a) : (b))

// ------------------ node.h ----------------------------------
#include "global.h"

class node
{
private:
	double val;
	int oper;
	node* left;
	node* right;
public:
	node();  // be careful in initializing
	~node();

	bool isNum();  // is the node simple number?
	void readtree();
	double  evaluate();

	void SetValue(double v); // change val
	double GetValue();

	void SetOper(int o);
	int GetOper();
	void SetLeft(node* l);
	node* GetLeft();	
	void SetRight(node* r);
	node* GetRight();		
};

// --------------------- token.h ------------------

#include "global.h"

// token is a single element you read form the file
// either an operator or a number

class token
{
private:
	double val;
	int oper;
public:
	token() ;
	~token();

	bool isNum(); // is it a number?

	void SetValue(double v);
	double GetValue();

	void SetOper(int o);
	int GetOper();
}