// ConsoleApplication33.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include <iostream>

using namespace std;

#define  _CRT_SECURE_NO_WARNINGS

class A

{

public:

	A(A* a)

	{

		cout << "1" << endl;

	}

	A(const A&a)

	{

		cout << "A copy" << this << endl;

	}

	A()

	{

		p = new char[20];

		strcpy_s(p, 2, "a");

		cout<<"A():"<<this << endl;

	}

	virtual  ~A()

	{

		if(p!=NULL)

		delete[] p;

		cout<<" ~A():"<<this << endl;

	}

	 int k = 4;

public:

	char *p;

};

class B :public A

{

public:

	B()

	{

		p = new char[20];

		strcpy_s(p, 3, "aa");

		cout<<"B():" << this <<endl;

	}

	~B()

	{

		delete[] p;

		cout << "~B():" << this << endl;

	}

public:

	char *p;

};

class C :public B

{

public:

	C()

	{

		p = new char[20];

		strcpy_s(p, 4, "aaa");

		cout << "C():" << this << endl;

	}

	~C()

	{

		delete[] p;

		cout << "~C():" << this << endl;

	}

public:

	char *p;

	int m = 3;

};

void howtodelete(A* base)

{

	delete base;

}

int main()

{

	A* a = NULL;

	//注意  使用指针这里一定要new 然后才能用父类指针去接收 否则会出错 new delete要配对

	C* c1=new C;

	a = &(*c1);

	howtodelete(a);

	system("pause");

}