class A {\fbox{A}
public: A() { cout << "A"; } ~A() { cout << "A"; } }; class B : public A {\fbox{B}
public: B() { cout << "B"; } ~B() { cout << "B"; } };
class A {\fbox{A}
public: A() { cout << "A"; } ~A() { cout << "A"; } }; class B : public A {\fbox{B}
public: B() { cout << "B"; } ~B() { cout << "B"; } };