Exam 2008 Question 5

Guys for question 5 I would like to know is it correct to assume the following:

Language: C++ (QT)
class DVD:public QObject {
	...
	public
		DVD(QString anID, QString aTitle, QString aPrice);
	...
};
 
class Entertainment:public DVD {
	...
	public
		Entertainment(QString anID, QString aTitle, QString aPrice, QString aType, QString aRating);	
};
 
class Educational: public DVD {
	...
	public
		Educational(QString anID, QString aTitle, QString aPrice, QString aSubject, QString aGradeLevel);
	...
};

Note Entertainment and Educational are derived from DVD. Assuming my code above is correct...

Why does this line of code fail telling me that there is no such constructor for DVD

Language: C++ (QT)
DVD* dvd1 = new Entertainment("111", "Three Colours: Blue", 145.50, "Drama", "PG10");

I know this is not required for question 5... but I'm finding that as I write the code out that I am missing little gems of information all over. So any help would be appreciated. Thank you.

Your constructor has 5 QString types, and you used a double for your 3rd variable.

Thanks franlowe,

That was embarassingly simple on my part.

Not to worry, I think we all have those moments more often than we care to admit.

yup. the only reason we spot them is because we've made the same mistake over and over again