C++ 继承方式

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#include<iostream>using namespace std;class CFather{public:    int m_nAge;protected:    int m_nSex;private:    int m_nName;    CFather()    {        cout << m_nAge << endl;        cout << m_nSex << endl;        cout << m_nName << endl;    }};//class CSon :public CFather//公有继承，基类中公有和保护不变；私有无法访问//class CSon :protected CFather//保护继承，基类中公有和保护都变为保护继承；私有无法访问；class CSon :private CFather//私有继承，基类中的公有和保护都变味私有；基类继承下来的私有还是无法访问；{public:    CSon()    {        cout << m_nAge << endl;        cout << m_nSex << endl;        cout << m_nName << endl;    }};class CSonSon :public CSon{public:    CSonSon()    {        cout << m_nAge << endl;        cout << m_nSex << endl;        cout << m_nName << endl;    }};int main(){    CSon son;    //公有继承，只能在外部访问继承的公有，其他无法访问；、    //保护继承，所有在外部的继承都不可访问；    //私有继承，所有继承在外部都不可访问；    son.m_nAge;    son.m_nName;    son.m_nSex;    system("pause");    return 0;}

#include<iostream>class Parent{public:    Parent(int var = -1)    {     m_nPub = var;      m_nPtd = var;     m_nPrt = var;    }public:    int m_nPub;protected:    int m_nPtd;private:    int m_nPrt;};class Child1 : public Parent{public:    int GetPub(){return m_nPub;};    int GetPtd(){return m_nPtd;};    int GetPrt(){return m_nPrt;};     //A           ERROR};class Child2 : protected Parent{public:    int GetPub(){return m_nPub;};    int GetPtd(){return m_nPtd;};    int GetPrt(){return m_nPrt;};     //B           ERROR};class Child3 : private Parent{public:    int GetPub(){return m_nPub;};    int GetPtd(){return m_nPtd;};    int GetPrt(){return m_nPrt;};     //C           ERROR};int main(){    Child1 cd1;    Child2 cd2;    Child3 cd3;    int nVar = 0;    //public inherited    cd1.m_nPub = nVar;      //D         RIGHT    cd1.m_nPtd = nVar;      //E         ERROR    nVar = cd1.GetPtd();    //F         RIGHT    //protected inherited           cd2.m_nPub = nVar;      //G         ERROR    nVar = cd2.GetPtd();    //H         RIGHT    //private inherited         cd3.m_nPub = nVar;      //I         ERROR    nVar = cd3.GetPtd();    //J         RIGHT    return 0;}

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