下面程序的执行结果为 #include'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;} }; ①void main( ) ② { ③ C cc; ④ cc.Seta(1); ⑤ cc.Display_a( ); ⑥ cc.Setc(2,2,3); ⑦ cc.Dispaly-b( ); ⑧ cc.Display_c( ); }