C++-primer-plus(第6版)中文版编程练习答案第15章.docx

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1、1、//tv.h#ifndefTV_H_#defineTV_H_#includeusingnamespacestd;classTv{friendclassRemote;public:enum{Off,On};enum{MinVal,MaxVal=20};enum{Antenna,Cable};enum{TV,DVD};enum{USUAL,EXCHANGE};Tv(ints=Off,intmc=125):state(s),volume(5),maxchannel(mc),channel(2),mode(Cable),

2、input(TV){}~Tv(){}voidonoff(){state=(state==On)?Off:On;}boolison()const{returnstate==On;}boolvolup();boolvoldown();voidchanup();voidchandown();voidset_mode(){mode=(mode==Antenna)?Cable:Antenna;}voidset_input(){input=(input==TV)?DVD:TV;}voidsettings()const;voidset_rmode(R

3、emote&r);private:intstate;intvolume;intmaxchannel;intchannel;intmode;intinput;};classRemote{private:friendclassTv;enum{USUAL,EXCHANGE};intmode;intfmode;public:Remote(intm=Tv::TV,intf=USUAL):mode(m),fmode(f){}boolvolup(Tv&t){returnt.volup();}boolvoldown(Tv&t){returnt.vold

4、own();}voidonoff(Tv&t){t.onoff();}voidchanup(Tv&t){t.chanup();}voidchandown(Tv&t){t.chandown();}voidset_chan(Tv&t,intc){t.channel=c;}voidset_mode(Tv&t){t.set_mode();}voidset_input(Tv&t){t.set_input();}voidmode_show()const{cout<<"Remotepretentmodeis"<

5、evoidTv::set_rmode(Remote&r){if(ison()){r.fmode=Remote::EXCHANGE;r.mode_show();}}#endif//tvfm.h#ifndefTVFM_H_#defineTVFM_H_#includeusingnamespacestd;classTv;classRemote{public:enumState{Off,On};enum{MinVal,MaxVal=20};enum{Antenna,Cable};enum{TV,DVD};private:int

6、mode;public:Remote(intm=TV):mode(m){}boolvolup(Tv&t);boolvoldown(Tv&t);voidonoff(Tv&t);voidchanup(Tv&t);voidchandown(Tv&t);voidset_chan(Tv&t,intc);voidset_mode(Tv&t);voidset_input(Tv&t);};classTv{public:friendvoidRemote::set_chan(Tv&t,intc);enumState{Off,On};enum{MinVal,

7、MaxVal=20};enum{Antenna,Cable};enum{TV,DVD};Tv(ints=Off,intmc=125):state(s),volume(5),maxchannel(mc),channel(2),mode(Cable),input(TV){}~Tv(){}voidonoff(){state=(state==On)?Off:On;}boolison()const{returnstate==On;}boolvolup();boolvoldown();voidchanup();voidchandown();void

8、set_mode(){mode=(mode==Antenna)?Cable:Antenna;}voidset_input(){input=(input==TV)?DVD:TV;}voidsettings()