CSC134 OOP in C++ - Date Class with Operators

Date Class with Operators

File Date.h:

#ifndef DATE_H
#define DATE_H

class Date
{
public:
  Date() { month = 1; day = 1; year = 2001; }
  Date(int mm, int dd, int yy) { month = mm; day = dd; year = yy; }
  Date(const Date &old) { month = old.month; day = old.day;
                                             year = old.year; }
  void setDate(int mm, int dd, int yy=2003) { month = mm; day = dd;
                                              year = yy; }
  void showDate() const;
  void showWithName() const;
  void operator=(const Date&);
  int operator==(const Date&) const;
  int operator!=(const Date&) const;
  int operator<(const Date&) const;
  int operator>(const Date&) const;
private:
  int month;
  int day;
  int year;
};

#endif

File Date.C:

#include "Date.h"
#include <iostream.h>

// print the Date in mm/dd/yy format
void Date::showDate() const
{
  cout << month << '/' << day << '/' << year;
}

// print the Date with month name
void Date::showWithName() const
{
  switch (month)
    {
    case 1  : cout << "January ";
      break;
    case 2  : cout << "February ";
      break;
    case 3  : cout << "March ";
      break;
    case 4  : cout << "April ";
      break;
    case 5  : cout << "May ";
      break;
    case 6  : cout << "June ";
      break;
    case 7  : cout << "July ";
      break;
    case 8  : cout << "August ";
      break;
    case 9  : cout << "September ";
      break;
    case 10 : cout << "October ";
      break;
    case 11 : cout << "November ";
      break;
    case 12 : cout << "December ";
      break;
    }
  cout << day << ", " << year;
}

//  assignment operator
void Date::operator=(const Date& old)
{
  month = old.month;
  day = old.day;
  year = old.year;
}

//  equality operator
int Date::operator==(const Date& second) const
{
  if (month == second.month && day == second.day
                                       && year == second.year)
    return 1;
  else
    return 0;
}

//  inequality operator
int Date::operator!=(const Date& second) const
{
  if (month != second.month || day != second.day
                                       || year != second.year)
    return 1;
  else
    return 0;
}

//  less than operator
int Date::operator<(const Date& second) const
{
  int less = 0;
  if (year < second.year)
    less = 1;
  else
    if (year == second.year && month < second.month)
      less = 1;
    else
      if (year == second.year && month == second.month
                                           && day < second.day)
	less = 1;
  return less;
}

//  greater than operator
int Date::operator>(const Date& second) const
{
  int more = 0;
  if (year > second.year)
    more = 1;
  else
    if (year == second.year && month > second.month)
      more = 1;
    else
      if (year == second.year && month == second.month
                                           && day > second.day)
	more = 1;
  return more;
}

File main.C:

#include <iostream.h>
#include "Date.h"


//  test the Date class

int main()
{
  int mon;
  int da;
  Date today(10,17,2003);
  Date entry;

  cout << "Enter your birthday (month and day): ";
  cin >> mon >> da;
  entry.setDate(mon,da);
  cout << "This year your birthday is on ";
  entry.showDate();
  cout << " (";
  entry.showWithName();
  cout << ")" << endl;
  if (today == entry)
    cout << "Happy Birthday!!" << endl;
  else
    if (today < entry)
      cout << "Your birthday is still to come this year." << endl;
    else
      cout << "You already had your birthday this year." << endl;
}

To Compile and Execute:

>g++ Date.C main.C
>a.out

Output:


> a.out
Enter your birthday (month and day): 4 21
This year your birthday is on 4/27/2003 (April 27, 2003)
You already had your birthday this year.

> a.out
Enter your birthday (month and day): 12 4
This year your birthday is on 12/4/2003 (December 4, 2003)
Your birthday is still to come this year.

> a.out
Enter your birthday (month and day): 10 17
This year your birthday is on 10/17/2003 (October 17, 2003)
Happy Birthday!!