Design a C++ class to store a date in three integers month day and year

Date
Design a C++ class called Date. The class should store a date in three integers: month, day and year. There should be member functions to print the date in the following forms:
12125109
December 25, 2009
25 December 2009
Demonstrate the class by writing a complete program implemenring it.
input Validation: Do not accept values for the day greater than 31 or less than 1. Do
not accept values for the month greater than 12 or less than 1.

Answer:

//  Date Class
#include <iostream>
#include <cstring>
using namespace std;

// Constants
const int NUM_MONTHS = 12;
const int NAME_SIZE = 10;

// Declaration of the Date class

class Date
{
private:
   int month;  // To hold the month
   int day;    // To hold the day
   int year;   // To hold the year
   
   // An array of char arrays to hold
   // the names of the months
   char names[NUM_MONTHS][NAME_SIZE];
   
   // Private member function to assign
   // the month names to the names array
   void setNames();
   
public:
   // Constructors
   Date();
   Date(int, int, int);
   
   // Mutators
   void setMonth(int m);
   void setDay(int d);
   void setYear(int y);

   // Functions to print the date
   void showDate1();
   void showDate2();
   void showDate3();
};

//**********************************
// Default constructor             *
//**********************************

Date::Date()
{
   setNames();
}

//**********************************
// Overloaded constructor          *
// Parameters: m is the month      *
//             d is the day        *
//             y is the year       *
//**********************************

Date::Date(int m, int d, int y)
{
   setMonth(m);
   setDay(d);
   setYear(y);
   setNames();
}

//**********************************
// Member function setNames        *
// This function assigns the names *
// of the months to the names      *
// array.                          *
//**********************************

void Date::setNames()
{
   strcpy(names[0], "January");
   strcpy(names[1], "Febraury");
   strcpy(names[2], "March");
   strcpy(names[3], "April");
   strcpy(names[4], "May");
   strcpy(names[5], "June");
   strcpy(names[6], "July");
   strcpy(names[7], "August");
   strcpy(names[8], "September");
   strcpy(names[9], "October");
   strcpy(names[10], "November");
   strcpy(names[11], "December");
}

//**********************************
// Member function setMonth        *
//**********************************

void Date::setMonth(int m)
{
   if (m >= 1 && m <= 12)
      month = m;
   else
   {
      cout << m << " is not a valid "
           << "value for the month.\n"; exit (EXIT_FAILURE); } } //********************************** // Member function setDay * //********************************** void Date::setDay(int d) { if (d >= 1 && d <= 31)
         day = d;
   else
   {
      cout << d << " is not a valid "
           << "value for the day.\n";
      exit(EXIT_FAILURE);
   }
}

//**********************************
// Member function setYear         *
//**********************************

void Date::setYear(int y)
{
   year = y;
}

//**********************************
// Member function showDate1       *
// Displays the date in the form   *
// MM/DD/YY                        *
// Example: 12/25/06               *
//**********************************

void Date::showDate1()
{
   cout << month << "/" 
        << day << "/" 
        << year << endl;
}

//*************************************
// Member function showDate2          *
// Displays the date in the following *
// form: December 25, 2006            *
//*************************************

void Date::showDate2()
{
   cout << names[month+1]
        << " " << day << ", "
        << year << endl;
}

//*************************************
// Member function showDate3          *
// Displays the date in the following *
// form: 25 December, 2006            *
//*************************************

void Date::showDate3()
{
   cout << day << " " 
        << names[month+1] 
        << " " << year << endl;
}


//*************************************
// Function main                      *
//*************************************

int main()
{
   // Create a Date object and initialize it
   // using the overloaded constructor.
   Date today(12, 25, 2006);

   // Show the date in form #1.
   today.showDate1();
   
   // Store a new month, day, and year
   // in the object.
   today.setMonth(6);
   today.setDay(16);
   today.setYear(2006);
   
   // Show the date in form #2.
   today.showDate2();
   
   // Show the date in form #3.
   today.showDate3();
   return 0;
}