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| author | Fuwn <[email protected]> | 2024-04-07 23:18:32 -0700 |
|---|---|---|
| committer | Fuwn <[email protected]> | 2024-04-07 23:18:32 -0700 |
| commit | c1b6ffe70bd281c6c230fd63fabcaac2aff47514 (patch) | |
| tree | e8af3b1782a7cd0754590ed618fddc1bdb9b7385 /chapter14/clocks.h | |
| download | dscode-main.tar.xz dscode-main.zip | |
Diffstat (limited to 'chapter14/clocks.h')
| -rw-r--r-- | chapter14/clocks.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/chapter14/clocks.h b/chapter14/clocks.h new file mode 100644 index 0000000..f918983 --- /dev/null +++ b/chapter14/clocks.h @@ -0,0 +1,102 @@ +// FILE: clocks.h (part of namespace main_savitch_14)
+// CLASSES PROVIDED:
+// clock (keeps track of a single time value)
+// cuckoo_clock (clock descendant with a cuckoo that makes noise on the hour)
+// clock24 (clock descendant for time in 24-hour version)
+//
+// CONSTRUCTOR for the clock class:
+// clock( )
+// Postcondition: The clock is set to 12:00 (midnight).
+//
+// MODIFICATION MEMBER FUNCTIONS for the clock class:
+// void set_time(int hour, int minute, bool morning)
+// Precondition: 1 <= hour <= 12, and 0 <= minute <= 59.
+// Postcondition: The clock's time has been set to the given hour and
+// minute (using usual 12-hour time notation). If the third parameter,
+// morning, is true, then this time is from 12:00 midnight to 11:59am.
+// Otherwise this time is from 12:00 noon to 11:59pm.
+//
+// void advance(int minutes)
+// Postcondition: The clock has been moved forward by the indicated
+// number of minutes.
+// Note: A negative argument moves the clock backward.
+//
+// CONSTANT MEMBER FUNCTIONS for the clock class:
+// int get_hour( ) const
+// Postcondition: The value returned is the current hour using a 12-hour
+// clock.
+//
+// int get_minute( ) const
+// Postcondition: The value returned is the current minute on the clock.
+//
+// bool is_morning( ) const
+// Postcondition: If the clock's time lies from 12:00 midnight to
+// 11:59am (inclusive), the function returns true; otherwise it
+// returns false.
+//
+// NONMEMBER FUNCTIONS for the clock class:
+// bool operator <(const clock& c1, const clock& c2)
+// Postcondition: Returns true if the time on c1 is earlier than the time
+// on c2 over a usual day (starting at midnight); otherwise returns false.
+//
+// INHERITED MEMBER FUNCTIONS for the cuckoo_clock class:
+// The cuckoo_clock inherits all public members from the clock class.
+//
+// ADDITIONAL CONSTANT MEMBER FUNCTION for the cuckoo_clock class:
+// bool is_cuckooing( ) const;
+// Postcondition: The return value is true if the current minute is zero
+// (so that the cuckoo is making noise).
+//
+// INHERITED MEMBER FUNCTIONS for the clock24 class:
+// The clock24 class inherits all public members from the clock class,
+// except for get_hour, which is overriden (as described below):
+//
+// OVERRIDEN CONSTANT MEMBER FUNCTION for the clock24 class:
+// int get_hour( ) const
+// Postcondition: The value returned is the current hour using a 24-hour
+// clock.
+//
+// VALUE SEMANTICS for the clock, cuckoo_clock, and clock24 classes:
+// Assignments and the copy constructor may be used with any of
+// these objects.
+
+#ifndef CLOCK_H
+#define CLOCK_H
+
+namespace main_savitch_14
+{
+ class clock
+ {
+ public:
+ // CONSTRUCTOR
+ clock( );
+ // MODIFICATION FUNCTIONS
+ void set_time(int hour, int minute, bool morning);
+ void advance(int minutes);
+ // CONSTANT FUNCTIONS
+ int get_hour( ) const;
+ int get_minute( ) const;
+ bool is_morning( ) const;
+ private:
+ int my_hour;
+ int my_minute;
+ int my_morning;
+ };
+
+ class cuckoo_clock : public clock
+ {
+ public:
+ bool is_cuckooing( ) const;
+ };
+
+ class clock24 : public clock
+ {
+ public:
+ int get_hour( ) const;
+ };
+
+ // NONMEMBER FUNCTION for the clock class:
+ bool operator <(const clock& c1, const clock& c2);
+}
+
+#endif
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