基類與派生類之間的互相轉(zhuǎn)換，使用指針的情況

源程序：

p.p1 { margin: 0; font: 11px Helvetica }
p.p2 { margin: 0; font: 11px Helvetica; min-height: 13px }
span.Apple-tab-span { white-space: pre }

#include<iostream>

using namespace std;

class CBase

{

protected:

int n;

public:

CBase(int i):n(i){}

void Print()

{

cout<<"CBase:n="<<n<<endl;

}

};

class CDerived:public CBase

{

public:

int v;

CDerived(int i):CBase(i),v(2*i){}

void Func(){};

void Print()

{

cout<<"CDerived:n="<<n<<endl;

cout<<"CDerived:v="<<v<<endl;

}

};

int main()

{

CDerived objDerived(3);

CBase objBase(5);

CBase *pBase = &objDerived;

CDerived *pDerived;

pDerived = &objDerived;

cout<<"使用派生類指針調(diào)用函數(shù)"<<endl;

pDerived->Print();

pBase=pDerived;

cout<<"使用基類指針調(diào)用函數(shù)"<<endl;

pBase->Print();

//pBase->Func(); //錯(cuò)誤，通過(guò)基類指針不能調(diào)用派生類函數(shù)

//pDerived=pBase; //錯(cuò)誤，派生類指針=基類指針

pDerived=(CDerived*)pBase; //強(qiáng)制類型轉(zhuǎn)換，派生類指針=基類指針

cout<<"使用派生類指針調(diào)用函數(shù)"<<endl;

pDerived->Print();

return 0;

}

運(yùn)行結(jié)果：

總結(jié)

以上是生活随笔為你收集整理的自考新教材-p233的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。