有如下两个类定义: class XX{ private: double xl; protected: double x2; public: double x3; }; class YY:protected XX{ private: double yl; protected: double y2; public: double y3; 在类YY中保护成员变量的个数是( )。A.1B.2C.3D.4

有如下两个类定义: class XX{ private: double xl; protected: double x2; public: double x3; }; class YY:protected XX{ private: double yl; protected: double y2; public: double y3; 在类YY中保护成员变量的个数是( )。

A.1

B.2

C.3

D.4


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