c++ virtual functions

Royale with Cheese

I have an exam in c++ tomorrow morning and there's a question that's likely to appear on it that I really don't know how to do.

class A {
public:
	void f(){
		cout << "f" << endl;
		g();
		}
	virtual void g(){
		cout << "g" << endl;
	}
};

How do I write a main program for that so that A::f is executed but A::g is not? Any help would be much appreciated.

Herbal Deity

virtual just means overridable...

You could write a class "B" which inherits from A, and override g() such that it does nothing, and then when you call B::f(), when it calls g() nothing happens instead of it printing "g".

But ultimately, I don't understand your question 100%.

Royale with Cheese

Sorry the print statements I added myself just so I could see what was happening. I thought about using a subclass to override f() so that it doesn't call g() but that seemed liked cheating.

This is the question as it appears in the exam:

Tears in Rain

Make a subclass of A called B

B over-rides A::g() with a new function called B::g()

Thus, when an instance b of B is created, and we call b.f(), the following functions are called in turn:

A::f()
B::g()

And that is your solution.