【单选题】下列程序中画线处应填入的语句是 class Base { public: void fun( ){cout<<'Base of fun'<<end1;} }; class Derived:public Base { void fun( ) { ______//显示基类的成员函数fun cout<<'Derived of fun'<<end1; } };
【单选题】对于下面程序段,表达式正确的是( )。 class Base {public:int b;}; class Base1:public base{ }; class Base2:public base{ }; class Derived:public base1,public base2{public:int fun ( );}; Derived d;