NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c++-part2/18393

Text File | 1996-08-05 | 5.0 KB | 213 lines

Path: ix.netcom.com!netnews
From: [e-mail](leonel wizel )
Newsgroups: comp.lang.c++
Subject: help with homework
Date: 20 Apr 1996 03:30:46 GMT
Organization: Netcom
Message-ID: <4l9lp6$[e-mail]>
NNTP-Posting-Host: ix-nyc17-20.ix.netcom.com
X-NETCOM-Date: Fri Apr 19  8:30:46 PM PDT 1996

To all of you experienced programmers.  I have some problems
understanding the object concept and that is the reason that I need
some help from you all experienced programmers.


the problem that I have no I have to improve a class called Time


I have to write a driver program that tests the tick member function in
a loop that prints the time in standard format during each iteration of
the loop to illustrate that the tick member function works correctly.
I have

 to be sure to test the following cases:

    incrememting into the next minute
    incrementing into the next hour.
    incrementing into the next day.(i.e., 11:59:59 PM to 12:00:00 AM).

then I have to modify and add a different class or functions to perfor
error checking on the initializer values for data members month, day,
and year. and provide a member function nextDay to increment day by
one.  The Da

te object should always remain ina consisten state.   and write a
driver program that tests the nextday function in a loop that prints
the date during each iteration of the loop to illustrate that the next
day function wo

rks correctly.

    incrementing into the next month.
    incrementing into the next year.

then modified Time and modified Date into one class called DateAndTime.
modified the tick functio to call the next day function if the time is
incremented into the next day.  modified function printStandard and
PrintMilit

ary to output the date in addition to the time, and write a driver to
test the new class DateAndTime; to test incrementing the time into the
next day.

    then modify the set function in the program to return appropiate
error values in an attempt is made to set a data member of an object of
class Time to an invalid value.


Thank you very much for your cooperation.

    This is that I have written so far.

    File no 1.


//times3.h

#ifndef TIME3_H
#define TIME3_H

class Time {
    public:
        Time(int = 0, int = 0, int = 0);  // constructor

//set functions

    void setTime(int, int, int);  //set hour, minute, second
    void setHour(int);
    void setMinute(int);
    void setSecond(int);

   //get functions

int getHour();  //return hour
int getMinute();  //return minute
int getSecond();  //return second

void tick_increment();   // increments time
void printMilitary();  //output military time
void printStandar();  //output standard time

private:
    int hour;
    int minute;
    int second;
};

#endif


            File No 2.

//this is file time3.cpp
#include "time3.h"
#include <iostream.h>


//constructor function.

Time::Time(int hr, int min, int sec)  {setTime (hr, min, sec); }

void Time::setTime(int h, int m, int s)
{
    hour = (h >= 0 && h < 24) ? h : 0;   //check for negative values
    minute = (m >= 0 && m < 60) ? m : 0;
    second = (s >= 0 && s < 60) ? s : 0;
}
void Time::setMinute(int m)

 {minute = (m >= 60) ? m : 0;}

void Time::setSecond(int s)

{second = (s >= 60) ? s : 0;}

int Time::getHour()  {return hour; }

int Time::getMinute() { return minute;}

int Time::getSecond() { return second; }

void Time::tick_increment()
{
    if(second == 60)
    {
        second = 0;
        minute++;
    }
        second++;
    if (second == 60)
       {
        second = 0;
        minute++;
        }
     if(minute == 60)
     {
        minute = 0;
        hour++;
      }
}

void Time::printMilitary()
{
    cout << (hour < 10 ? "0" : "") << hour << ":"
         << (minute < 10 ? "0" : "") << minute <<":"
         << (second < 10 ? "0" : "") << second;
}
void Time::printStandard()
{
    cout << ((hour == 0 || hour == 12) ? 12 : hour % 12) << ":"
         << (minute < 10 ? "0" : "") << minute << ":"
         << (second < 10 ? "0" : "")  << second
         << (hour < 12 ? " AM" : " PM");
}


        file No 3

#include <iostream.h>
#include "time3.h"
#include "time3.cpp"

main()
{
    Time t;

    t.setTime(4, 00, 31);

    for(long int i = 1; i <= 2; i++)
    {
        cout << "Hour " << t.getHour() << endl << endl;
        cout << "Minute " <<t.getMinute() << endl;
        cout << "Second" << t.getSecond() << endl << endl;
        cout << "the initial time before incrementing is: " << endl;

    t.printStandard();
    t.printMilitary();

    t.tick_increment();

    cout << " Hour " << t.getHour() << endl << endl;
    cout << " Minute " << t.getMinute() << endl;
    cout << " Second " << t.getSecond() << endl << endl;

    cout << "The time after incrementing is: " << endl;

    t.printStandard();
    t.PrintMilitary();
    }
return 0;
}



This are the files that I am working on it; but I encounter some
difficulties improving all the classes to work respectively with the
specifications all this code is preliminary.



    thank you very much to all of you for your suggestions.