基类:

class human{

 public:

        int getHumanType{ return m_iType; }

       vitual printHumanType() {};

private:

      int m_iType;

};

子类:

class yellowHuman: public human{

public:

  vitual printHumanType()

  {

        cout << "it's yellow human\n";

  }

};

class whiteHuman: public human{

public:

  vitual printHumanType()

  {

        cout << "it's white Human\n";

  }

};

class blackHuman: public human{

public:

  vitual printHumanType()

  {

        cout << "it's blackHuman\n";

  }

};

// 应用

int main()

{

    human*  humanTest[3];

   humanTest[0]= new yellowHuman;

   humanTest[1]= new whiteHuman;

   humanTest[2]= new blackHuman;

   for(int i=0;i<3;i++)

   {

       humanTest[i]->printHumanType();

   }

    return 0;

}

结果：

it's yellow human

it's white Human

it's blackHuman

至于为什么会这么输出，请详细研究C++   virtual相关内容

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