阅读程序，写结果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;}