1、封装电视机的类
class TV
{
enum{ On,Off }; //电视状态
enum{ minVol,maxVol = 100 }; //音量从0到100
enum{ minChannel = 1,maxChannel = 255 }; //频道从1到255
private:
int mState; //电视状态,开机,还是关机
int mVolume; //电视机音量
int mChannel; //电视频道
public:
TV()
{
this->mState = Off;//默认关机
this->mVolume = minVol;
this->mChannel = minChannel;
}
void onOrOff(void)
{
this->mState = (this->mState == On ? Off:On);
}
//加大音量
void volumeUp(void)
{
if(this->mVolume >= maxVol)
return;
this->mVolume++;
}
//减小音量
void volumeDown(void)
{
if(this->mVolume <= minVol)
return;
this->mVolume--;
}
//增加频道
void channelUp(void)
{
if(this->mChannel >= maxChannel)
return;
this->mChannel++;
}
//减小频道
void channelDown(void)
{
if(this->mChannel <= minChannel)
return;
this->mChannel--;
}
//显示电视机的状态
void showTVState(void)
{
cout<<"电视机的状态为:"<< (this->mState==On ? "开机":"关机") <<endl;
cout<<"电视机的音量:"<<this->mVolume<<endl;
cout<<"电视机的频道:"<<this->mChannel<<endl;
}
};
void test01()
{
TV tv;
tv.onOrOff();//开机
tv.volumeUp();//调四次音量
tv.volumeUp();
tv.volumeUp();
tv.volumeUp();
tv.channelUp();//调三次频道
tv.channelUp();
tv.showTVState();
}
运行结果:
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2、设置遥控器的类2-1
class TV
{
friend class Remote;
//默认为私有
enum{ On,Off }; //电视状态
enum{ minVol,maxVol = 100 }; //音量从0到100
enum{ minChannel = 1,maxChannel = 255 }; //频道从1到255
private:
int mState; //电视状态,开机,还是关机
int mVolume; //电视机音量
int mChannel; //电视频道
public:
TV()
{
this->mState = Off;//默认关机
this->mVolume = minVol;
this->mChannel = minChannel;
}
void onOrOff(void)
{
this->mState = (this->mState == On ? Off:On);
}
//加大音量
void volumeUp(void)
{
if(this->mVolume >= maxVol)
return;
this->mVolume++;
}
//减小音量
void volumeDown(void)
{
if(this->mVolume <= minVol)
return;
this->mVolume--;
}
//增加频道
void channelUp(void)
{
if(this->mChannel >= maxChannel)
return;
this->mChannel++;
}
//减小频道
void channelDown(void)
{
if(this->mChannel <= minChannel)
return;
this->mChannel--;
}
//显示电视机的状态
void showTVState(void)
{
cout<<"电视机的状态为:"<< (this->mState==On ? "开机":"关机") <<endl;
cout<<"电视机的音量:"<<this->mVolume<<endl;
cout<<"电视机的频道:"<<this->mChannel<<endl;
}
};
//遥控器类
class Remote
{
private:
TV *pTv;
public:
Remote(TV *pTv)
{
this->pTv = pTv;
}
//音量的加减
void volumeUp(void)
{
//调节的电视机的音量
this->pTv->volumeUp();
}
void volumeDown(void)
{
this->pTv->volumeDown();
}
//频道的加减
void channelUp(void)
{
this->pTv->channelUp();
}
void channelDown(void)
{
this->pTv->channelDown();
}
//电视开关
void onOrOff(void)
{
this->pTv->onOrOff();
}
//遥控器设置频道设置
void setChannel(int num)
{
//判断 频道 是否有效
if(num >= TV::minChannel && num<= TV::maxChannel )
{
this->pTv->mChannel = num;
}
}
void showTVState(void)
{
this->pTv->showTVState();
}
};
void test02()
{
TV tv;
Remote remote(&tv);
remote.onOrOff();
remote.volumeUp();
remote.volumeUp();
remote.volumeUp();
remote.volumeUp();
remote.channelUp();
remote.channelUp();
remote.showTVState();
remote.setChannel(75);
remote.showTVState();
}
运行结果: