C++ 中【子類轉父類】和【父類轉子類】的方法

// EX_EXAM.cpp : 定義控制台應用程式的進入點。//#include "stdafx.h"#include <iostream>using namespace std;class A{public:virtual void foo() { cout<<"A foo"<<endl; }void pp() { cout<<"A pp"<<endl; }};class B: public A{public:void foo() { cout<<"B foo"<<endl; }void pp() { cout<<"B pp"<<endl; }void FunctionB() { cout<<"Excute FunctionB!"<<endl; }};int _tmain(int argc, _TCHAR* argv[]){A a;B b;A *pa=&b;pa->foo();pa->pp();if (B *pb=dynamic_cast<B*>(pa)){cout<<"Convert from B to A successfully"<<endl;(dynamic_cast<B*>(pa))->FunctionB();(dynamic_cast<B*>(pa))->foo();(dynamic_cast<B*>(pa))->pp();(*pa).foo();}elsecout<<"Cannot convert from B to A"<<endl;return 0;}