Anne的宠物小屋有12个笼子，每个笼子可以放不同的动物，但只能放1只或0只，包括猫Cat，狗Dog，蛇Snake.

定义描述宠物小屋的类shelves，其中有12笼子用于存放各种宠物。

定义虚拟基类Animal，包括纯虚函数ShowMe，显示每个宠物的情况，包括类型、颜色、体重和喜爱的食物。

定义派生类Cat，Dog，Snake，具体实现上述纯虚函数。

编写main函数，可增加、删除笼子中的宠物，查询每个笼子中存放的宠物类型，（包括笼子为空的情况），统计笼中宠物的种类和数量-Anne cottages pet has 12 cages, each cage can be put in different animals, but only put one or 0, including the Cat Cat, Dog Dog, Snake Snake. The definition of the type described in pets cabin shelves, of which there are 12 cages used to store all kinds of pets. The definition of a virtual base class Animal, including the pure virtual function ShowMe, show that each of pets, including type, color, weight, and favorite food. Derived class definition of Cat, Dog, Snake, concrete realization of the above pure virtual function. Preparation of main function, to increase, the deletion of the pet cage, query each cage in the pet store types, (including the case of the cage is empty), statistics pet cage type and quantity of