// virtual_default_parm_test.cpp

using namespace std;

#include <iostream>

class base
{  public:
	virtual void read_out(int = 1, int = 2);
	void call_read_out();
};

class derived : public base
{  public:
	virtual void read_out(int = 0, int = -1);
};

void base::read_out(int c1, int c2)
{	cout << "This is base::read_out" << endl;
	cout << "c1 default: " << c1 << endl;
	cout << "c2 default: " << c2 << endl;
}

void base::call_read_out()
{	read_out();
}

void derived::read_out(int c1, int c2)
{	cout << "This is derived::read_out" << endl;
	cout << "c1 default: " << c1 << endl;
	cout << "c2 default: " << c2 << endl;
}

int main()
{	base b;
	derived d;

	b.read_out();
	d.read_out();
	b.call_read_out();
	d.call_read_out();
}