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847天前#include <iostream> |
using namespace std; |
class TV |
{ |
public: |
friend class Tele; |
TV() :on_off ( off ),volume ( 20 ),channel ( 3 ),mode ( tv ) {} |
private: |
enum {on,off}; |
enum {tv,av}; |
enum {minve,maxve=100}; |
enum {mincl,maxcl=60}; |
bool on_off; |
int volume; |
int channel; |
int mode; |
}; |
class Tele |
{ |
public: |
void OnOFF ( TV&t ) {t.on_off= ( t.on_off==t.on ) ?t.off:t.on;} |
void SetMode ( TV&t ) {t.mode= ( t.mode==t.tv ) ?t.av:t.tv;} |
bool VolumeUp ( TV&t ); |
bool VolumeDown ( TV&t ); |
bool ChannelUp ( TV&t ); |
bool ChannelDown ( TV&t ); |
void show ( TV&t ) const; |
}; |
bool Tele::VolumeUp ( TV&t ) |
{ |
if ( t.volume<t.maxve ) |
{ |
t.volume++; |
return true; |
} |
else |
{ |
return false; |
} |
} |
bool Tele::VolumeDown ( TV&t ) |
{ |
if ( t.volume>t.minve ) |
{ |
t.volume--; |
return true; |
} |
else |
{ |
return false; |
} |
} |
bool Tele::ChannelUp ( TV&t ) |
{ |
if ( t.channel<t.maxcl ) |
{ |
t.channel++; |
return true; |
} |
else |
{ |
return false; |
} |
} |
bool Tele::ChannelDown ( TV&t ) |
{ |
if ( t.channel>t.mincl ) |
{ |
t.channel--; |
return true; |
} |
else |
{ |
return false; |
} |
} |
void Tele::show ( TV&t ) const |
{ |
if ( t.on_off==t.on ) |
{ |
cout<<"电视现在"<< ( t.on_off==t.on?"开启":"关闭" ) <<endl; |
cout<<"音量大小为："<<t.volume<<endl; |
cout<<"信号接收模式为："<< ( t.mode==t.av?"AV":"TV" ) <<endl; |
cout<<"频道为："<<t.channel<<endl; |
} |
else |
{ |
cout<<"电视现在"<< ( t.on_off==t.on?"开启":"关闭" ) <<endl; |
} |
} |
int main() |
{ |
Tele t1; |
TV t2; |
t1.show ( t2 ); |
t1.OnOFF ( t2 ); |
t1.show ( t2 ); |
cout<<"调大声音"<<endl; |
t1.VolumeUp ( t2 ); |
cout<<"频道+1"<<endl; |
t1.ChannelUp ( t2 ); |
cout<<"转换模式"<<endl; |
t1.SetMode ( t2 ); |
t1.show ( t2 ); |
system ( "pause" ); |
} |
