// File:	decimal.hpp
// Description:	Decimal class 
// Project:	-
// Version:	1.00
// Revision:	A
// Content:	Simple decimal class for "Cobol like" numerical manipulations
//		
//
// Language:	Zortech C++, ver. 3.0
// OS:		MS-DOS
// Date:	04.04.1997
// Author:	Peter Fabo
// Mail:	fabo@fmph.uniba.sk
// Phone:	00421 7 729248
//		00421 7 724000 kl. 516
//		00421 905 615536
//		00421 7 729248
//
// Copyright	Centaur s.r.o. 	
//		MFF UK, Mlynska dolina
//		842 15 Bratislava
//		Slovakia
//
// The copyright to the computer program(s) herein
// is the property of company Centaur s.r.o., Slovakia.
// The program(s) may by used and/or copied only with
// the written permission of company Centaur s.r.o.
// or in accordance with the terms and conditions 
// stipulated in the agreement/contract under which
// the program(s) have been suplied.
//
// History
// Date		Who	   V/R	What
// 04.04.1997	pf	1.00/A  creation
// 
//
//
// Imlementation Dependencies

#ifndef __DECIMAL_HPP_
#define __DECIMAL_HPP_

#include <math.h>
#include <ctype.h>
#include <stdlib.h>
#include <iostream.hpp>

#define DECIMAL_LENGHT 6

// Header data
enum decimal_error
{
  DECIMAL_OK,
  DECIMAL_OVERFLOW,
  DECIMAL_DIV0
};

class decimal
{
  static long int decimalLenght;	// lenght of decimal part
  static long int decimalMask;		// 10^decimalLenght
  static long int decimalMask_2;	// 10^(decimalLenght/2) -> for oper. *

  long int integerPart;
  long int decimalPart;

  int decimalPartLenght();		// internal function for calculating
					// lenght of dec. part, used for
					// printing '0' a.e. in 1.00001 etc

// void setAccuracy(int);		// not implemented
// int accuracy;

  public:

  decimal(double);			// constructors
  decimal(long int=0);
  decimal(char *);
  
  decimal& operator=(decimal &);
  decimal& operator-();

  decimal& operator +=(decimal &a){ return (*this)+a; }
  decimal& operator -=(decimal &a){ return (*this)-a; }
  decimal& operator *=(decimal &a){ return (*this)*a; }
  decimal& operator /=(decimal &a){ return (*this)/a; }

  friend decimal operator +(decimal &, decimal &);
  friend decimal operator -(decimal &, decimal &);
  friend decimal operator *(decimal &, decimal &);
  friend decimal operator /(decimal &, decimal &);

  friend ostream& operator <<(ostream &, decimal &);
  friend istream& operator >>(istream &, decimal &);

//  friend int operator < (decimal &, decimal &);	// not implemented
//  friend int operator > (decimal &, decimal &);
//  friend int operator <= (decimal &, decimal &);
//  friend int operator >= (decimal &, decimal &);

  operator  double ();
};

#endif __DECIMAL_HPP_

// End of header data decimal.hpp