填空题

请将下列类定义补充完整
class Basepublic: void fun()cout＜＜"Base::fun"＜＜end1;;
class Derived:public Base

public:
void fun()
______//显式调用基类的fun函数
cout＜＜"Derived::fun"＜＜end1;

;