继承和派生1

#include <iostream>    using namespace std;    class Data    {    public:        Data(int i):x(i){cout<<"A";}        ~Data(){ cout<<"B";}    private:        int x;    };    class Base    {    public:        Base(int i):b1(i){cout<<"C";}        ~Base(){ cout<<"D";}    private:        int b1;    };    class Derived:public Base    {    public:        Derived (int i,int j):Base(i),d1(j){            cout<<"E";        }        ~Derived(){cout<<"F";}    private:        Data d1;    };    int main()    {        Derived obj(1,2);        return 0;    }