（1）定义四个类：CPU、RAM、CDROM、COMPUTER

（2）具体要求

1，每个类定义构造函数和析构函数，如结果图输出

2，每个类分别定义run和stop接口函数

3，COMPUTER为组合类，包含CPU、RAM、CDROM的对象

4，主函数：定义一个COMPUTER对象，并调用run和stop

CPU和RAM的run和stop事件由COMPUTER调用

-(1) defines four categories: CPU, RAM, CDROM, COMPUTER (2) the specific requirements of 1, the definition of each class constructor and destructor, as the results of Figure 2, the output of each class are defined interface functions run and stop 3 , COMPUTER for the combination of classes, including CPU, RAM, CDROM of the object 4, the main function: to define a COMPUTER object and call run and stop CPU and RAM, run and stop the event called by the COMPUTER