106: #include <iostream>
107: #include <iomanip>
108: #include <string>
110: using namespace std;
111: 
112: #include "ccc_time.h"
113: 
114: class Clock {
116: public:
117:    /**
118:       Constructs a clock that can tell the local time.
119:       @param use_military true if the clock uses military format
120:    */
121:    Clock(bool use_military); 
123:    /**
124:       Gets the location of this clock.
125:       @return the location
126:    */
127:    string get_location() const;
129:    /**
130:       Gets the hours of this clock.
131:       @return the hours, in military or am/pm format
132:    */
133:    int get_hours() const;
135:    /**
136:       Gets the minutes of this clock.
137:       @return the minutes
138:    */
139:    int get_minutes() const;
141:    /**
142:       Checks whether this clock uses miltary format.
143:       @return true if miltary format
144:    */
145:    bool is_military() const;
146: private:
147:    bool military;
148: };
149: 
150: Clock::Clock(bool use_military)
151: { military = use_military; }
154: 
155: string Clock::get_location() const
156: { return "Local"; }
159: 
160: int Clock::get_hours() const
161: { Time now;
163:   int hours = now.get_hours();
164:   if (military) return hours;
165:   if (hours == 0) return 12;
167:   else if (hours > 12) return hours - 12;
169:   else return hours;
171: }
172: 
173: int Clock::get_minutes() const
174: { Time now;
176:   return now.get_minutes();
177: }
178: 
179: bool Clock::is_military() const
180: { return military;  }
183: 
184: class TravelClock : public Clock {
186: public:
187:    /**
188:       Constructs a travel clock that can tell the time
189:       at a specified location
190:       @param mil true if the clock uses military format
191:       @param loc the location
192:       @param diff the time difference from the local time
193:    */
194:    TravelClock(bool mil, string loc, int diff);
195:    string get_location() const;
196:    int get_hours() const;
197: private:
198:    string location;
199:    int time_difference;
200: };
201: 
202: TravelClock::TravelClock(bool mil, string loc, int diff)
203:    : Clock(mil)
204: { location = loc;
206:   time_difference = diff;
207:   while (time_difference < 0) 
208:       time_difference = time_difference + 24;
209: }
210: 
211: string TravelClock::get_location() const
212: { return location; }
215: 
216: int TravelClock::get_hours() const
217: { int h = Clock::get_hours();
219:   if (is_military())
220:       return (h + time_difference) % 24;
221:   else
222:   {  h = (h + time_difference) % 12;
224:      if (h == 0) return 12;
225:      else return h;
226:   }
227: }
228: 
229: int main()
230: { Clock clock1(true);
232:   TravelClock clock2(true, "Rome", 9);
233:   TravelClock clock3(false, "Tokyo", -7);
234: 
235:   cout << clock1.get_location() << " time: " 
236:       << clock1.get_hours() << ":"
237:       << setw(2) << setfill('0') 
238:       << clock1.get_minutes() 
239:       << setfill(' ') << "\n";
240:   cout << clock2.get_location() << " time: " 
241:       << clock2.get_hours() << ":"
242:       << setw(2) << setfill('0') 
243:       << clock2.get_minutes() 
244:       << setfill(' ') << "\n";
245:   cout << clock3.get_location() << " time: " 
246:       << clock3.get_hours() << ":"
247:       << setw(2) << setfill('0') 
248:       << clock3.get_minutes() 
249:       << setfill(' ') << "\n";
250:   return 0;
251: }