// CIS 235 Lecture 06 - Operator Overloading

#ifndef NUMBER_H
#define NUMBER_H
#include <string>
#include <iostream>
using namespace::std;

class Number
{
friend ostream & operator << (ostream &, const Number &);
friend istream & operator >> (istream &, Number &);
friend Number    operator +   (int, const Number & );  // mixed mode, int on left
public:
	Number(void);
	Number(int);
	Number(const Number &);
	~Number();
	
	Number & setValue(int);   // return reference for function chaining
	int    getInteger(void) const;
	string getString(void)  const;

	Number operator+ (const Number &)    const;
	Number operator+ (int )              const;   // mixed mode on the right
	bool   operator==( const Number & )  const;
	bool   operator!=( const Number & r) const  // inline code
	{
		return !( (*this) == r );
	}
	bool   operator<(const Number & )    const;

	const Number & operator=(const Number &);

	const Number & print(ostream & ) const; // return reference for function chaining

private:
	static const string name1[20]; // names of integers 0 - 19
	static const string name2[10]; // names of 20, 30, ..., 80, 90
	static const string name3[5];  // names of thousand, million, billion

	// the following function converts an integer to a string 
	//     1234 converts to one thousand two hundred thirty four
	static string figureString(int toConvert, int counterFuntionCalls);

	int theNumber;
	string theString;
};

#endif