继承的语法：class 子类 : 继承方式 父类

继承降属性权限，不可升属性权限

继承方式一共有三种：

• 公共继承

• 保护继承

• 私有继承

#include <iostream>
#include <string>  
using namespace std;class Base1
{
public:int m_A;
protected:int m_B;
private:int m_C;
};//公共继承class Son1 : public Base1
{
public:void func() {m_A;// 可访问public权限m_B;//	可访问protected权限//m_C;// 不可访问}
};void myClass() {Son1 s1;s1.m_A;//其他类只能访问到公共权限;
}class Base2
{
public:int m_A;
protected:int m_B;
private:int m_C;
};class Son2 :  protected Base2
{
public:void func() {m_A;// 可访问protected权限m_B;// 可访问protected权限//m_C;//不可访问}
};void myClass2() {Son2 s;//s.m_A; //不可访问
}//私有继承
class Base3 {public:int m_A;
protected:int m_B;
private:int m_C;
};class Son3 : private Base3
{
public:void func() {m_A; //可访问private权限m_B; //可访问private权限//m_C; //不可访问}
};class GrandSon3 : public Son3 {
public:void func() {//Son3是私有继承，所以继承Son3的属性在GrandSon3中都无法访问到//m_A;//m_B;//m_C;}
};int main() {system("pause");return 0;}