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Display 111 contains the interface le for a class called DigitalTime DigitalTime is a class whose values are times of day, such as 9:30 Only the public members of the class are part of the interface The private members are part of the implementation, even though they are in the interface le The label private: warns you that these private members are not part of the public interface Everything that a programmer needs to know in order to use the class DigitalTime is explained in the comment at the start of the le and in the comments in the public section of the class de nition As noted in the comment at the top of the interface le, this class uses 24-hour notation, so, for instance, 1:30 PM is input and output as 13:30 This and the other details you must know in order to effectively use the class DigitalTime are included in the comments given with the member functions We have placed the interface in a le named dtimeh The suf x h indicates that this is a header le An interface le is always a header le and so always ends with the suf x h Any program that uses the class DigitalTime must contain an include directive like the following, which names this le:
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When you write an include directive, you must indicate whether the header le is a prede ned header le that is provided for you or is a header le that you wrote If the header le is prede ned, write the header le name in angular brackets, like <iostream> If the header le is one that you wrote, write the header le name in quotes, like "dtimeh" This distinction tells the compiler where to look for the header le If the header le name is in angular brackets, the compiler looks wherever the prede ned header les are kept in your implementation of C++ If the header le name is in quotes, the compiler looks in the current directory or wherever programmer-de ned header les are kept on your system Any program that uses our DigitalTime class must contain the above include directive that names the header le dtimeh That is enough to allow you to compile the program, but is not enough to allow you to run the program In order to run the program you must write (and compile) the de nitions of the member functions and the overloaded operators We have placed these function and operator de nitions in another le, which is called the implementation le Although it is not required by most compilers, it is traditional to give the interface le and the implementation le the same name The two les do, however, end in different suf xes We have placed the interface for our class in the le named dtimeh and the implementation for our class in a le named dtimecpp The suf x you use for the implementation le depends on your version of C++ Use the same suf x for the implementation le as you normally use for les that contain C++ programs (Other common suf xes are cxx and hxx) The implementation le for our DigitalTime class is given in Display 112 After we explain how the various les for our class interact with each other, we will return to Display 112 and discuss the details of the de nitions in this implementation le
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 //This is the header file dtimeh This is the interface for the class DigitalTime //Values of this type are times of day The values are input and output in 24-hour //notation, as in 9:30 for 9:30 AM and 14:45 for 2:45 PM #include <iostream> using namespace std; class DigitalTime { public: DigitalTime(int theHour, int theMinute); DigitalTime( ); //Initializes the time value to 0:00 (which is midnight) getHour( ) const; getMinute( ) const; void advance(int minutesAdded); //Changes the time to minutesAdded minutes later void advance(int hoursAdded, int minutesAdded); //Changes the time to hoursAdded hours plus minutesAdded minutes later friend bool operator ==(const DigitalTime& time1, const DigitalTime& time2); friend istream& operator >>(istream& ins, DigitalTime& theObject); friend ostream& operator <<(ostream& outs, const DigitalTime& theObject); private: int hour; int minute;
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static void readHour(int& theHour); //Precondition: Next input to be read from the keyboard is //a time in notation, like 9:45 or 14:45 //Postcondition: theHour has been set to the hour part of the time //The colon has been discarded and the next input to be read is the minute static void readMinute(int& theMinute); //Reads the minute from the keyboard after readHour has read the hour static int digitToInt(char c); //Precondition: c is one of the digits 0 through 9 //Returns the integer for the digit; for example, digitToInt( 3 ) returns 3 };
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