Ejemplo n.º 1
0
double print_total(std::ostream& os, const Quote& item, size_t n)
{
    double ret = item.net_price(n);
    os << "ISBN:" << item.isbn() << "# sold: " << n << "total due: "
        <<ret << std::endl;
    return ret;
}
// for test
int main(int argc, char **argv)
{
	Quote q("asd", 10.5);
	Bulk_Quote b_q("f**k", 10.5, 20, 0.2);
	Quote *p;
	p = &q;
	cout << "20本asd的总价格为:" << p->net_price(20) << endl;
	p->debug();

	p = &b_q;
	cout << "20本f**k的总价格为:" << p->net_price(20) << endl;
	p->debug();

	system("pause");
	return 0;
}
Ejemplo n.º 3
0
int main()
{
    Bulk_quote bulk_quote("bulk_quote_1", 10.10, 10, 0.5);

    // The pointer is of static type Quote, but it's dynamic type is Bulk Quote
    // Because of polymorphism the Bulk Quote implementation of the net_price()
    // method gets called.
    Quote *quote_pointer = &bulk_quote;
    quote_pointer->net_price(5);

    // The reference is of static type Quote, but it's dynamic type is Bulk Quote
    // Like with the pointer, the Bulk Quote implementation of the net_price()
    // method gets called.
    Quote &quote_reference = bulk_quote;
    quote_reference.net_price(5);

    // The static type of this variable is Quote. Here the Bulk Quote object
    // gets upcasted. The Quote part of bulk_quote gets copied into quote, but
    // the rest is not handled. Because of the cast the Quote implementation of
    // the net_price() method gets called.
    Quote quote = bulk_quote;
    quote.net_price(5);

    return 0;
}
double print_total(ostream& os, const Quote& item, size_t number){

    double ret = item.net_price(number);
    os << "ISBN: " << item.isbn() << " # sold: " << number
       << " total due: " << ret << endl;
    return ret;

}
Ejemplo n.º 5
0
double print_total(std::ostream& out, const Quote& item, std::size_t n)
{
	// depending on the type of the object bound to the item parameter
	// call corresponding functuon either Quote::net_price or Bulk_quote::net_price
	double ret = item.net_price(n);
	out << "IBSN: " << item.isbn() << " # sold: " << n << " total due: " << ret << std::endl;
	return ret;
}
Ejemplo n.º 6
0
// non-member
double print_total(std::ostream &os, const Quote &item, size_t n)
{
    // depending on the type of the object bound to the item parameter
    // calls either Quote::net_price or Bulk_quote::net_price
    double ret = item.net_price(n);
    os << "ISBN: " << item.isbn() // calls Quote::isbn
       << " # sold: " << n << " total due: " << ret << std::endl;
     return ret;
}
Ejemplo n.º 7
0
  double print_total(ostream& os, Quote const& item, size_t sold)
  {
    double net_price = item.net_price(sold);

    os << "isbn: " << item.isbn() << ", sold: " << sold 
      << ", total due: " << net_price << endl;

    return net_price;
  }
Ejemplo n.º 8
0
int main()
{
	Quote base("000111", 50);
	print_total(cout, base, 10);	//calls Quote::net_price

	Bulk_quote bulk("000111", 50, 5, 0.19);
	print_total(cout, bulk, 10);	//calls Bulk_quote::net_price

	Quote *baseP = &bulk;
	cout << baseP->net_price(10) << endl;	//calls Bulk_quote::net_price

	cout << baseP->Quote::net_price(10) << endl;	//calls Quote::net_price
	system("pause");
}
Ejemplo n.º 9
0
void printTotal(ostream& os, const Quote& book, const size_t bookNum)
{
    os << book.isbn() <<":" <<book.net_price(bookNum);
}