//https://www.facebook.com/CungHocLapTrinhUIT/
//Đoạn code 1
#include <iostream>
using namespace std;

class A{
public:
	A(){
		cout << "Constructor A" << endl;
	}
	~A(){
		cout << "~Destructor A" << endl;
	}
};

class B : public A
{
public:
	B(A &a){
		cout << "Constructor B" << endl;
	}
	~B(){
		cout << "~Destructor B" << endl;
	}
};

void main(){
	A a;
	B b(a);
}

//Đoạn code 2
#include <iostream>
using namespace std;

class A{
public:
	A(){
		cout << "Constructor A" << endl;
	}
	~A(){
		cout << "~Destructor A" << endl;
	}
};

class B : public A
{
public:
	B(A a){
		cout << "Constructor B" << endl;
	}
	~B(){
		cout << "~Destructor B" << endl;
	}
};

void main(){
	A a;
	B b(a);
}