填空题

请将下列类定义补充完整。
class Basepublic:void fun( )cout＜＜"Base::fun"＜＜endl;;
class Derived:public Base

public:
void fun( )
______//显式调用基类的fun函数
cout＜＜"Derived::fun"＜＜endl;

;