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C++ 成员访问符

• public members are accessible from outside the class

• private members cannot be accessed (or viewed) from outside the class

• protected members cannot be accessed from outside the class, however, they can be accessed in inherited classes. 也就是说能被 其它成员函数，子类成员函数、友元函数访问

请你来说一下C++中struct和class的区别

在C++中，可以用struct和class定义类，都可以继承。区别在于：structural的默认继承权限和默认访问权限是public，而class的默认继承权限和默认访问权限是private。

请你回答一下C++类内可以定义引用数据成员吗？

可以，必须通过类的构造函数初始化列表初始化。

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