Cpp-learning/继承1/2、继承方式.cpp

//4.6.2   继承方式

//继承的语法:class 子类 : 继承方式  父类

//继承方式一共有三种:

//?公共继承

//?保护继承

//?私有继承






#include <iostream>

class Base1
{
public:
	int m_A;
protected:
	int m_B;
private:
	int m_C;
};


class Son1 :public Base1
{
public:
	void func()
	{
		m_A = 10;      //父类中的公共权限成员到子类中依然是公共权限
		m_A = 10;      //父类中的保护权限成员到子类中依然是保护权限
		//m_C = 10;      //父类中的私有权限成员到子类中依然是私有权限
	}

};

void test01()
{
	Son1 s1;
	s1.m_A = 100;
	//s1.m_B = 100;      //在Son1中  m_B 是保护权限  类外访问不到
}

//保护继承
class Base2
{
public:
	int m_A;
protected:
	int m_B;
private:
	int m_C;

};

class Son2 :protected Base2
{
public:
	void func()
	{
		m_A = 100;         //父类公共到子类中变成保护权限
		m_B = 100;         //父类保护到子类中变成保护权限
		//m_C = 100;       //子类访问不到
	}
};

void test02()
{
	Son2 s1;
	//s1.m_A = 1000;         //在Son2中  m_A变为保护权限  因此类外访问不到
	//s1.m_B = 1000;         //在Son2中  m_A变为保护权限  因此类外访问不到
}

class Base3
{
public:
	int m_A;
protected:
	int m_B;
private:
	int m_C;

};

class Son3 :private Base3
{
public:
	void func()
	{
		m_A = 100;        //父类中公共成员，子类变为私有成员
		m_B = 100;        //父类中保护乘员，子类变为私有成员
		//m_C = 100;      //父类中私有成员，子类访问不到
	}
};

class Grandson :public Son3
{
public:
	void func()
	{
		//m_A = 1000;       //到了Son3中  m_A变为私有  即使是儿子  也是访问不到
		//m_B = 1000;       //到了Son3中  m_B变为私有  即使是儿子  也是访问不到
	}
};

void test03()
{
	Son3 s1;
	//s1.m_A = 1000;       //变为私有成员  类外访问不到
	//s1.m_C = 1000;       //变为私有成员  类外访问不到
}

int main()
{



	system("pause");

	return 0;
}