#include <cstdlib>

#include <iostream>

using namespace std;

class A{int m_a;};

class B{int m_b;} ;

class C:public A,public B

{

int m_c; 

};

int main(int argc, char *argv[])

{

C *pc=new C;

B *pb=dynamic_cast<B*>(pc);

A *pa=dynamic_cast<A*>(pc);

cout<<pc<<endl;//0x892a20

cout<<pb<<endl;//0x892a24

cout<<pa<<endl;//0x892a20,和pc地址一样

cout<<(C*)pb<<endl;//0x892a20//指向对象c的地址

cout<<pb<<endl;//0x892a24,pb指针值并不发生变化

system("PAUSE");

return EXIT_SUCCESS;

}