[分析题,4分] #include “iostream.h” class A{ public: A( ) { cout<<”A begins” ; } ~A( ) { cout<<”A ends”; } void print( ) { cout<<”I am A”; } virtual void show() { cout<<”A is great”; } } }; class B :public A{ public: B( ) { cout<<”B begins” ; } ~B( ) { cout<<”B ends” ; } void print ( ) { cout<<”I am B” ; } void show() { cout<<”B is great” } }; void main( ) { A obj_b; A *p; p=new B; p->show(); p=&obj_b; p->print(); }

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