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- // tv.h -- Tv and Remote classes
- #ifndef TV_H_
- #define TV_H_
- class Tv
- {
- public:
- friend class Remote; // Remote can access Tv private parts
- enum {Off, On};
- enum {MinVal,MaxVal = 20};
- enum {Antenna, Cable};
- enum {TV, DVD};
- Tv(int s = Off, int mc = 125) : state(s), volume(5),
- maxchannel(mc), channel(2), mode(Cable), input(TV) {}
- void onoff() {state = (state == On)? Off : On;}
- bool ison() const {return state == On;}
- bool volup();
- bool voldown();
- void chanup();
- void chandown();
- void set_mode() {mode = (mode == Antenna)? Cable : Antenna;}
- void set_input() {input = (input == TV)? DVD : TV;}
- void settings() const; // display all settings
- private:
- int state; // on or off
- int volume; // assumed to be digitized
- int maxchannel; // maximum number of channels
- int channel; // current channel setting
- int mode; // broadcast or cable
- int input; // TV or DVD
- };
- class Remote
- {
- private:
- int mode; // controls TV or DVD
- public:
- Remote(int m = Tv::TV) : mode(m) {}
- bool volup(Tv & t) { return t.volup();}
- bool voldown(Tv & t) { return t.voldown();}
- void onoff(Tv & t) { t.onoff(); }
- void chanup(Tv & t) {t.chanup();}
- void chandown(Tv & t) {t.chandown();}
- void set_chan(Tv & t, int c) {t.channel = c;}
- void set_mode(Tv & t) {t.set_mode();}
- void set_input(Tv & t) {t.set_input();}
- };
- #endif
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