描述：这个实验中需要实现的是拍卖系统的3个核心的类（Class Date, class Advertisement, and class Client）

目的：

1，使用C++的数据类型；

2，实现所有声明的函数；

3，使用预处理器实现包含。-Descr iption：This assessment requires the creation of three of the core classes of the auction project. Class Date, class Advertisement, and class Client are three of the fundamental classes in the system.

Outcomes: Students successfully completing this assignment would master the following outcomes.

Use fundamental C++ data types

Produce C++ class implementations given class declarations

Use the preprocessor to perform file inclusion