C++ subclass overrides base class and virtual processing-EEWORLD

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#include

class animal

{

public:

animal()

{

cout<<"animal construct"<

}

~animal()

{

cout<<"construct animal"<

}

virtual void breath() //virtual defines virtual function

{

cout<<"bubble2"<

}

};

class fish:public animal //Only call animal() in animal

{

public:

fish()

{

// cout<<"hello world"<

}

~fish()

{

// cout<<"construct helllo world"<

}

void breath()

{

//animal::breath();

//cout<<"fish bubble"<

}

};

void fn(animal *pan)

{

pan->breath();

}

void main()

{

fish fh;

//st.breath ();//If the subclass and the base class have two functions with the same name , the subclass will eventually overwrite the base class, which is called overloading.

animal *pan;

pan=&fh; //Change the pointer and replace the pointer of animal with fish. But it still outputs animal. If virtual is added before animal, it will output fish

fn(pan);

}

Keywords：C++ Reference address：C++ subclass overrides base class and virtual processing

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