#include using namespace std; class base{ protected: int x; }; class base1____________________// 继承 base { protected: int x1; }; C lass base2_______________________// 继承 base {protected: int x2; }; class derived______________________// 继承 base1 、 base2 {public: V oid set(){x=1;x1=2;x2=3;} V oid disp(){cout< ” , ” < ” , ” < }; void main() {derived d1; d 1.set(); d1.disp(); }