A date consists of a month, day, and year. Consider the class Date of such dates. Suppose that Date represents the month, day, and year as integers. For example, July 4, 1776, is month 7, day 4, and year 1776. a. Write specifi cations for a method within Date that advances any given date by one day. Include a statement of purpose, the preconditions and postconditions, a description of the arguments, and a description of any return value. b. Write a C++ implementation of this method. Design and specify any other method that you need. Include comments that will be helpful to someone who will maintain your implementation in the future.

#include <iostream>

#include <cmath>

using namespace std;

class Date

{

public:

Date ();

Date ( int mn, int day, int yr); // constructor

void display(); // function to display date

int GetMonth();

void SetMonth(int mn);

~Date();

private:

int month, day, year;

};

// constructor definition

Date::Date ()

{

month = day = year = 1;

}

Date::Date (int mn, int dy, int yr)

{

static int length[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

month = mn;

day = dy;

year = yr;

}

void Date::display()

{

static string name[] = {"nothing", "January", "February", "March", "April",

"May", "June", "July", "August", "September", "October",

"November", "December" };

cout << '\n' << name[month] << ' ' << day << "," << year << '\n';

}

Date::~Date()

{

cout << "Thank You for using DateLine Services and have a nice date\n";

}

int Date::GetMonth()

{

return month;

}

// Precondition: 1 <= mn <= 12

void Date::SetMonth(int mn)

{

month = mn;

}

int main()

{

Date mydate(1, 2, 1993);

Date date2(4,12,1994);

Date date3;

mydate.display();

date2.display();

date3.display();

}

Explanation:

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