请教c++高手，帮忙改改，急用，在线等，谢谢了！

#includeusing namespace std;struct Base1{int x;};struct Base2{float y;};struct Derived:Base1,Base2{};int main(){ Derived *pd=new Derived; pd->x=1;pd->y=2.0f; //void *pv=pd; //没必要转成void*啊 //Base2 *pb=static_cast