C++语言中class类中的private:私有数据和函数。 格式: class 类名{ private:私有数据和函数 public:公有数据和函数 protected:保护数据和函数 };
当前类之外的代码无法访问私有成员。
Code outside the current class cannot access private members.
然后定义book类，用私有成员变量代表每个字段。
The Book class is then defined, with private member variables for each field.
基类中的私有成员被继承，但不能从派生类访问。
Private members in base classes are inherited but are not accessible from derived classes.
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