dtime.h

AbsoluteC++中文第二版书上的源代码

//This is the header file dtime.h. 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.
#ifndef DTIME_H
#define DTIME_H

#include <iostream>
using std::istream;
using std::ostream;

namespace DTimeSavitch
{
    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;
    };

} //DTimeSavitch
#endif //DTIME_H