#ifndef FILM_H
#define FILM_H
#include <QString>
class Film {
protected:
QString title;
double dailyRate;
public:
Film(QString ti,double dr);
QString getTitle() const;
virtual double calculateRental(int num)const;
};
class Video: public Film {
public:
Video(QString ti,double dr,QString vt,int d);
QString getTitle() const;
QString getVideoType() const;
virtual double calculateRental(int num)const;
protected:
QString videoType;
int discount;
};
#endif // FILM_H
Film.cpp
#include "film.h"
#include <QString>
String ti,double dr){
title=ti;
dailyRate=dr;
}
QString Film::getTitle() const {
return title;
}
double Film::calculateRental(int num)const {
return dailyRate*num;
}
Video::Video(QString ti,double dr,QString vt,int d)
:Film(ti,dr){
videoType = vt;
discount = d;
}
QString Video::getTitle() const {
return title;
}
QString Video::getVideoType() const {
return videoType;
}
double Video::calculateRental(int num)const {
return (dailyRate*num)-discount;
}
main.cpp
#include <QtCore/QCoreApplication>
#include <QtCore/QTextStream>
#include "film.h"
using namespace std;
int main(int argc, char *argv[]) {
QCoreApplication a(argc, argv);
QTextStream cout(stdout, QIODevice::WriteOnly);
Film f("Top Gun", 10.00);
// Print out title and rental fee (based on 2 days rental).
cout << "Title: " << f.getTitle() << endl;
cout << "Rental Fee: " << f.calculateRental(2)<< endl;
cout <<" " << endl;//blank line
Video v("Top Gun", 10.00,"DVD",5);
// Print out title and rental fee (based on 2 days rental).
cout << "Title: " << v.getTitle() << endl;
cout << "Video Type: " << v.getVideoType() << endl;
cout << "Rental Fee: " << v.calculateRental(2) << endl;
}
how do I count the number of Film instances created? I know is something like that:
static int numOfFilms;
numOfFilms++;
how do I use the code?