newclock.h

C++编成数据结构与程序设计方法 D.S.Malk编著

//Header file newClock.h

#ifndef H_newClock
#define H_newClock

#include <iostream>

using namespace std;

class clockType
{
    friend ostream& operator<<(ostream&, const clockType&);
    friend istream& operator>>(istream&, clockType&);

public:
   void setTime(int hours, int minutes, int seconds);
      //Function to set the member variables hr, min, and sec.  
      //Postcondition: hr = hours; min = minutes; sec = seconds

   void getTime(int& hours, int& minutes, int& seconds) const;
      //Function to return the time.
      //Postcondition: hours = hr; minutes = min; seconds = sec

   clockType operator++();    
      //Overload the pre-increment operator.
      //Postcondition: The time is incremented by one second.

    bool operator==(const clockType& otherClock) const; 
      //Overload the equality operator.
      //Postcondition: Returns true if the time of this clock 
      //               is equal to the time of otherClock,
      //               otherwise it returns false.

    bool operator!=(const clockType& otherClock) const; 
      //Overload the not equal operator.
      //Postcondition: Returns true if the time of this clock 
      //               is not equal to the time of otherClock,
      //               otherwise it returns false.

    bool operator<=(const clockType& otherClock) const;
      //Overload the less than or equal to operator.
      //Postcondition: Returns true if the time of this clock
      //               is less than or equal to the time of 
      //               otherClock, otherwise it returns false.

    bool operator<(const clockType& otherClock) const;
      //Overload the less than operator.
      //Postcondition: Returns true if the time of this clock
      //               is less than the time of otherClock,
      //               otherwise it returns false.

    bool operator>=(const clockType& otherClock) const;
      //Overload the greater than or equal to operator.
      //Postcondition: Returns true if the time of this clock
      //               is greater than or equal to the time of 
      //               otherClock, otherwise it returns false.

    bool operator>(const clockType& otherClock) const;
      //Overload the greater than operator.
      //Postcondition: Returns true if the time of this clock
      //               is greater than the time of otherClock,
      //               otherwise it returns false.

    clockType(int hours = 0, int minutes = 0, int seconds = 0);  
      //Constructor to initialize the object with the values 
      //specified by the user. If no values are specified,
      //the default values are assumed.
      //Postcondition: hr = hours; min = minutes; 
      //               sec = seconds;


private: 
    int hr;  //variable to store the hours
    int min; //variable to store the minutes
    int sec; //variable to store the seconds
};

#endif