虚函数与纯虚函数请参考:http://blog.csdn.net/hackbuteer1/article/details/7558868
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#includeusing namespace std; class Animal { public: virtual void eat()=0; virtual void sleep()=0; }; class Cat:public Animal { public: void eat() { cout<<"The cat is eating now."< eat(); p->sleep(); cout<<"========================"<
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