有一个汽车类vehicle，它具有一个需传递参数的构造函数，类中的数据成员车轮个数wheels和车重weight放在保护段中；小车类car是它的私有派生类，其中包含载人数passenger-load；卡车类truck是vehicle的私有派生类，其中包含载人数passenger-load和重量payload。每个类都有相关数据的输出方法。-have an auto vehicle, it has a need to transfer parameters Constructors, Class members of the data Number wheels and wheel weights weight on the protection of; Trolley car category is the private derived class, which includes manned several passenger-load; trucks truck category is the private vehicle of your class, manned which includes several passenger-load weight and payload. Each of these categories has a data output method.