/* This is the specification of an abstract class called Money
   To be used it has to be the base of a more specialized class
	Money_comp
	Money_UK
	Money_display
	Money_cheap
   However all of these must provide the same member functions.  Yhe
   required functions are the virtual one below.
*/
#ifndef __Abstract_Money__
#define __Abstract_Money__
class Abstract_Money{ 
public:
 	// the = 0 makes sure that the derived classes
	// supply the declared functions
	// and guarantee that objects of class Money
	// can not be dleaclared... only those of the
	// deerived classes
	virtual Abstract_Money operator-() = 0 ;
	virtual friend int operator<(Abstract_Money a, Abstract_Money b) = 0 ;
	virtual friend int operator==(Abstract_Money a, Abstract_Money b) = 0 ;
	// The following are supplied by Abstract_Money in terms of the above
	// functions
	Abstract_Money operator-(Money b);
	friend int operator>(Abstract_Money a, Abstract_Money b);
	friend int operator>=(Abstract_Money a, Abstract_Money b);
	friend int operator<=(Abstract_Money a, Abstract_Money b);
	friend int operator!=(Abstract_Money a, Abstract_Money b);
}; // end class Abstract_Money
#endif

#ifndef __Dollars__
#define __Dollars__
class Dollars public: Abstract_Money {
	
	Dollars(const int n);
	Dollars(const int d0, int c0);
	Dollars(const double n);
	friend ostream& operator<<(ostream& s, Dollars n);

	Dollars operator+(Dollars b);
	Dollars operator*(int b);
	Dollars operator-();

	friend int operator<(Dollars a, Dollars b);
	friend int operator==(Dollars a, Dollars b);

	int dollars();
	int cents();
private:
	long int d;
	short int c;

}; // end class Dollar
#endif