What does the following code output? (If no room for 2 lines, put them side by side, // The following program defines two classes where everything is public, even data members. // Trace the program using your knowledge of classes. HINT: START IN maln() tinclude tinclude using namespace std: class Sale ( public: Sale (double price=0.0) { this->price - price; } virtual double bill() const ( return price; } double price: class StaffDiscount : public Sale ( public: StaffDiscount (double price) : Sale (price) () double bill() const override ( return price - (price discount/100) ; } const double discount - 10; void invoice (const Sale 6s) { cout.setf (ios::fixed); cout.setf (ios::showpoint); cout.precision (2) : cout « "s" <« s.bill() <« endl; int main () ( vector customers; StaffDiscount staff (15.50) : customers.push_back (staff) : invoice (stafE); invoice (customers(0]); return 0:

What does the following code output? (If no room for 2 lines, put them side by side, // The following program defines two classes where everything is public, even data members. // Trace the program using your knowledge of classes. HINT: START IN maln() tinclude tinclude using namespace std: class Sale ( public: Sale (double price=0.0) { this->price - price; } virtual double bill() const ( return price; } double price: class StaffDiscount : public Sale ( public: StaffDiscount (double price) : Sale (price) () double bill() const override ( return price - (price discount/100) ; } const double discount - 10; void invoice (const Sale 6s) { cout.setf (ios::fixed); cout.setf (ios::showpoint); cout.precision (2) : cout « "s" <« s.bill() <« endl; int main () ( vector customers; StaffDiscount staff (15.50) : customers.push_back (staff) : invoice (stafE); invoice (customers(0]); return 0:

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is:

Question

What does the following code output? (If no room for 2 lines, put them side by side)
// The following program defines two classes where everything is public, even data members.
// Trace the program using your knowledge of classes. HINT: START IN maln()
tinclude <iostream>
tinclude <vector>
using namespace std:
class Sale {
public:
Sale (double price=0.0) { this->price = price; }
virtual double bill () const ( return price; }
double price;
class StaffDiscount : public Sale {
public:
StaffDiscount (double price) : Sale (price) (}
double bill(0 const override ( return price - (price * discount/100); }
const double discount = 10;
void invoice (const Sale 65) {
cout.setf (ios::fixed); cout.setf (ios::showpoint);
cout.precision (2) ;
cout « "s" < s.bill() « endl;
int main () {
vector<Sale> customers:
StaffDiscount staff (15.50):
customers.push_back (staff);
invoice (staff);
invoice (customers (0]):
return 0;

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