Multiple inherance

[Jensdvvgsr]

Hey,
I want to give an instance of the class c the y value of an instance of the class b.
Who can I do this if I want to do it with pointers?

  class a {
protected:
	int x;
	
public:
	a(int);
};

a::a(int _x) {
	x = _x;
}

class b : public a {
protected:
	int y;

public:
	b(int, int);
	int get_y() {
		return y;
	}
};

b::b(int _x, int _y) : a(_x) {
	y = _y;
}

class c : public b {
private:
	int z;

public:
	c(int, int, int);
	void chng_y(b *member_b) {
		y = get_y()->member_b;
	}
};

c::c(int _x, int _y, int _z) : b(_x, _y) {
	z = _z;
}



int main()
{
    return 0;
}