虚函数的两种特性

#include <iostream>
using namespace std;

class A
{
public:
    virtual void vFunc();
};

class B:public A
{
public:
    virtual void vFunc();
};

class C: public B
{
public: 
    virtual void vFunc();
};

class D: public C
{
public: 
    //virtual void vFunc();
};

class E: public D
{
public: 
    //virtual void vFunc();
};

class F: public E
{
public: 
    virtual void vFunc();
};

void A::vFunc()
{
    cout << "vFuncA\n";
}

void B::vFunc()
{
    cout << "vFuncB\n";
}

void C::vFunc()
{
    cout << "vFuncC\n";
}

//void D::vFunc()
//{
//    cout << "vFuncD\n";
//}

//void E::vFunc()
//{
//    cout << "vFuncE\n";
//}
//
void F::vFunc()
{
    cout << "vFuncF\n";
}

void F::show()
{
    D::vFunc();
}

void main(void)
{
    C cc;
    A *ptr = &cc;
    ptr->vFunc();
    getchar();
}