Private function can access private variables.

这说明私有函数能访问私有变量。

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The Book class is then defined, with private member variables for each field.

然后定义book类，用私有成员变量代表每个字段。

youdao

The Book class is then defined, with private member variables for each field.

然后定义book类，用私有成员变量代表每个字段。

youdao