#include <iostream>
using namespace std;

class A{

public:
	A()
	{
		cout<<"construct A"<<endl;
	}

	A(int a)
	{
		cout<<"construct int A"<<endl;
	}

	virtual ~A()  //析構函數 必須 聲明為 虛函數，才能徹底釋放內存空間
	{
		cout<<"destory A"<<endl;
	}

};

class B : public A{

public:
	B()
	{
		cout<<"construct B"<<endl;
	}

	B(int a):A(a)  //構造器調用A中int構造方法
 

	{
		cout<<"construct int B"<<endl;
	}
	
	~B()
	{
		cout<<"destory B"<<endl;
	}

};

class C:public B{

public:

	C()
	{
		cout<<"construct C"<<endl;
	}

	~C()
	{
		cout<<"destory C"<<endl;
	}

};


int main()
{
	A *p = new C();

	delete p;


	return 0;
}

虛析構函數，派生類調用基類構造方法