下面程序的执行结果为 #includ"iostream" using namespace std; class A ｛ int a; public: void Seta(int x)｛a＝x;｝ void Display_a()｛cout＜＜a＜＜endl;｝ ｝; class B ｛ int b; public: void Setb(int x)｛b＝x;｝ void Dispaly_b()｛cout＜＜b＜＜endl;｝ ｝; class C:public A,private B ｛ private: int c; public: void Setc(int x,int y,int z) ｛c＝z;Seta(x);Setb(y);｝ void Display_c()｛cout＜＜c＜＜endl;｝ ｝; ① void main() ② ｛ ③ C cc; ④ cc.Seta(1); ⑤ cc.Display_a(); ⑥ cc.Setc(2,2,3); ⑦ cc.Dispaly_(); ⑧ cc.Display_c(); ｝