类：继承-父类有带参构造

#include <iostream>

class A
{
	int a;
public:
	A(int a)
	{
		std::cout<<"父类构造\n";
	}
	~A()
	{
		std::cout<<"父类析构\n";
	}
};

class B : public A
{
public:
	//当父类只有带参构造的时候，子类必须写构造函数，并且用
	//成员初始化列表为父类传参,告诉编译器调用父类的什么构造
	B() : A(3)
	{
		std::cout<<"子类构造\n";
	}
	B(int b) : A(b)
	{
	}
};


class SXB
{
	int size;
	int len;
	int* p;
public:
	SXB(int Size)
	{
		size = Size;
		len = 0;
		p = new int[size];
	}
	~SXB()
	{
		delete [] p;
	}
};
class Stack : private SXB
{
public:
	
};