根据不同的类可设置相应的构造函数、析构函数，以及设置、显示相关属性等相关行为。每个类至少定义4个成员函数。定义DOG类。（可设有年龄、体重、颜色等属性）-Depending on the category to set the corresponding constructor, destructor, as well as the settings, display properties and other related acts. The definition of each category at least four member functions. DOG category definition. (Available with the age, weight, color and other attributes)