/*An example of default constructors*/
#include <iostream>
#include <string>

using namespace std;

class AorBorC { protected: string t;  
public: string type(){return t;}
	AorBorC(){ t = "?"; }
};
class A: public AorBorC {
public: A(){ t="A"; }
};
class B: public AorBorC {
public: B(){ t="B"; }
};
class C: public AorBorC {
public: C(){ t="C"; }
};

int main()
{	AorBorC x;
	cout << x.type() << endl;

	A a;
	cout << a.type() << endl;
	B b;
	cout << b.type() << endl;
	C c;
	cout << c.type() << endl;

	AorBorC *p[]={&a, &b, &c, &x, NULL};

	for ( int i=0; p[i]!=NULL; i++)
		cout << (p[i])->type() << "\n";

	
}