#ifndef _Rational_h_
#define _Rational_h_

/* Derived class 'Rational' */

#include "Number.h"


class Rational : public Number   // 'Rational' is derived from 'Number'
{
  public:
  
    Rational( int numeratorInit = 0, int denominatorInit = 1 );   // constructor (default values: 0 and 1)
       
    virtual void read();          // read value from 'cin'
    virtual void write() const;   // write value to 'cout' (object is not changed)

    bool isPositive() const;   // return true, if object is positive (object is not changed)
    bool operator==( Rational other ) const; // return true if object and argument are equal (object is not changed)

    Rational operator+( Rational other ) const; // return sum of argument and object (object is not changed)
    Rational operator-( Rational other ) const; // return difference of argument and object (object is not changed)
    Rational operator*( Rational other ) const; // return product of argument and object (object is not changed)
    Rational operator/( Rational other ) const; // return division of object by argument (object is not changed)

  private:

    int numerator, denominator; // The numerator and denominator of the fraction
};

#endif