//    CIS 235                     Lecture 09
//    Inheritance
//    Base Class invent    (  Called supperclass in Java )
#ifndef INV_H
#define INV_H

#include <iostream>
using std::ostream;
#include <string>
using namespace::std;

class invent {
public:
	 invent( const invent &);    // copy constructor
	 invent( void);              // default constructor
	 invent( long c, long n, double cst, double p);

	 virtual ~invent(void);   // declared to be virtual to insure
	           // that derived class destructors will be called
	           // if the memory was acquired using a base
	           // class pointer

	 invent & setPrice(double);
	 invent & setNumber(long);
	 invent & setCost(double);
	 invent & setCode(long);

	 double getPrice(void)  const;
	 double getCost(void)   const;
	 long   getNumber(void) const;
	 long   getCode(void)   const;
	 double getRetailValue(void) const;

	 // Declaring a base class member function makes it polymorphic
	 // virtual is a sticky attribute - it cannot be removed
	 //     in derived classes
	 // virtual can be declared in the derived class, but is 
	 //       NOT NECESSARY 
	 virtual string identify(void) const;  // will return the class name
	                             // since virtual, cannot be static

	 virtual const invent &  print(ostream &) const;
	 virtual invent & kinput(void);

private:
	 double price;     // retail price per unit
	 double cost;      // wholesale cost per unit
	 long   code;      // product id number
	 long   number;    // number in stock
};

#endif