多态与非多态的对比（P262）

#include <iostream>
using namespace std;
class A{
public:
void func1(){
cout<<"A::func1"<<endl;
}
virtual void func2(){
cout<<"A::func2"<<endl;
}
};
class B:public A{
public:
virtual void func1(){
cout<<"B::func1"<<endl;
}
void func2(){
cout<<"B::func2"<<endl;
}
};
class C:public B{
public:
void func1(){
cout<<"C::func1"<<endl;
}
void func2(){
cout<<"C::func2"<<endl;
}
};
int main(){
C obj;
A *pa = &obj;
B *pb = &obj;
pa->func2();
pa->func1();
pb->func1();
return 0;
}