Sometimes it seems like programming is a well-paying, reliable job -- but the only way you can make sure of this is if you are always making yourself more valuable.
接口描述了类的行为和功能，而不需要完成类的特定实现。C++ 接口是使用抽象类来实现的，抽象类与数据抽象互不混淆，数...[作者空间]
