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虚函数与纯虚函数请参考:http://blog.csdn.net/hackbuteer1/article/details/7558868
#include <iostream> using 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."<<endl; } void sleep() { cout<<"The cat is sleeping now."<<endl; } }; class Bear:public Animal { public: void eat() { cout<<"The bear is eating now."<<endl; } void sleep() { cout<<"The bear is sleeping now."<<endl; } }; class Panda:public Cat,public Bear { public: void eat() { cout<<"The panda is eating now."<<endl; } void sleep() { cout<<"The panda is sleeping now."<<endl; } }; void show(Cat *p) { cout<<"========================"<<endl; p->eat(); p->sleep(); cout<<"========================"<<endl; } int main(int argc, char *argv[]) { Cat *p; Cat c; Panda d; p=&c; show(p); p=&d; show(p); return 0; }
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