1、　　编写一个含有public、protected、private成员的基类，使用public继承、protected继承、private继承分别生成派生类，测试派生类对基类不同类型成员的访问-the preparation of a public, protected, private containing members of the base class, using public, protected, private inheritance inheritance inheritance are respectively derived classes, tests on different types of derived class base class member access