AO{cout<"调用类A的析构函数<<endl;} (续) protected: int x: private: int class B public BO{cout<"调用类B的构造函数B0"<<end B(int c) cout<"调用类B的构造函数B(int)"<end; BO{cout<<"调用类B的析构函数<<endl;} protected int z, class c～A(){cout<<″调用类 A的析构函数″<<endl;} protected: int x; private: int y; }; class B { public: B(){cout<<″调用类 B的构造函数B()″<<endl;} B(int c) { z=c; cout<<″调用类 B的构造函数B(int)″<<endl; }～B(){cout<<″调用类 B的析构函数″<<endl;} protected: int z; }; class C （续）