C++ virtual 관련

#include<iostream>
using namespace std;
 
class C
{
public:
	virtual string toString()
	{
		return "class C";
	}
};
 
class B : public C
{
public:
	string toString()
	{
		return "class B";
	}
};
 
 
void displayObject(C* c)
{
	cout << c->toString().data() << endl;
}
 
int main()
{
	B b;
	C c;
	displayObject(&b);
	displayObject(&c);
 
	return 0;
}