#include<iostream>
using namespace std;
class A { 
public: 
	A() { cout<<"Constructing A"<<endl;} 
	~A(){ cout<<"Destructing A"<<endl;}
};
class B {
public: 
	B() { cout<<"Constructing B"<<endl;}
	~B(){ cout<<"Destructing B"<<endl;}
};
class C {
public: 
	C() { cout<<"Constructing C"<<endl;}
	~C(){ cout<<"Destructing C"<<endl;}
};
class D:public C 
{
public: 
	D() { cout<<"Constructing D"<<endl;}
	~D(){ cout<<"Destructing D"<<endl;}
	B b;
	A a;
	C c;
};

int main()
{
	D d;
    system("pause");
}

/*
Ö´Ðнá¹û£º
Constructing C
Constructing B
Constructing A
Constructing C
Constructing D
Destructing D
Destructing C
Destructing A
Destructing B
Destructing C
*/