// Abstract and concrete classes in C++
#include <iostream>
using namespace std;
class B
{
	public: virtual void f()=0;
};
class C : public B
{	public: void f(){cout << "C";}
};
//Draw a UML class diagram of B and C and make one of them {abstract}

main() // What compiles below?
{
	//B b;
	B * pb;
	C c;
	pb=&c;
}