Using the date class, make the following modifications:

Make the thanksgiving function:

Date Date::thanksGiving(int year)

{

Date turkeyDay(11, 01, year);

while (turkeyDay.weekday() != 4)

{

turkeyDay = turkeyDay + 1;

}

turkeyDay = turkeyDay + 21;

return turkeyDay;

}

into a method of the Date class. See files below: Date.cpp, Date.h. It receive the current year and returns the date for Thanksgiving.

In the Date class there are only a few overloaded operators for comparison. Add all of the following: <=, >=, and !=

Add a method to return the season as an integer: 0=winter, 1=spring, 2=summer and 3=fall for the northern hemisphere.

Your main program should illustrate the use of each method.

You may use March 20th for the first day of Spring. Use June 20th for the first day of summer, September 22 for the first day of fall, and December 21 as the first day of winter. You will find the overloaded operators handy for this.

A nice solution for this is to use an array to store the first date for each season, then loop to see where a date falls.

// Date.cpp

#include "Date.h"

Date::Date() {

//constructor to assign todays date to date

char data[9]; //holder for the date

_strdate_s(data); //gets the current date mm/dd/yy

string date=data; //copy to a string for parsing

month=stoi(date.substr(0,2)); //gets characters 0 and 1 of date and converts to int

day=stoi(date.substr(3,2)); //gets characters 3 and 4 of date and converts to int

year=stoi(date.substr(6,2))+2000; //gets characters 6 and 7 of date and converts to int

if(leapYear()) days2[2]=29; else days2[2]=28;

for(int m=0;m<13;m++) days[m]=days2[m];

}//constructor for today

static bool validDate(int m, int d, int y) {

bool valid=true; //assume it is valid until found to be invalid

if(y<1000) valid=false;

if(m<1 || m>12) valid=false;

if(leapYear(y)) days2[2]=29; else days2[2]=28;

if(d<1 || d>days2[m]) valid=false;

return valid;

}//validDate

Date::Date(int m, int d, int y) {

//constructor to assign values to month day and year

if(validDate(m,d,y)) {

month=m;

day=d;

year=y;

}

else {

month=day=1;

year=1970; //Unix time starting point

} //not valid: set to default valid date

for(int m=0;m<13;m++) days[m]=days2[m];

} //constructor with assigned values

Date::Date(int julian) {

//Fliegel-Van Flandern algorithm to convert Julian date to Gregorian number month, day, and year

gregorian(julian,month,day,year);

if(leapYear()) days2[2]=29; else days2[2]=28;

for(int m=0;m<13;m++) days[m]=days2[m];

}//Date Julian

Date::Date (string str) { //constructor for todays date as "mm/dd/year

//Parse str by adding one char at a s time to the token until a "/" is encounter.

//When "/" is encountered start the next token

//int p=0;

int count=0;

int num[3];

string token[3];

int len=str.length();

for(int p=0; p

if(str.substr(p,1)=="/") count++;

else token[count]+=str.substr(p,1);

}//parse str to create array of tokens

bool error=false;

for(int p=0;p<3;p++) {

try {

num[p]=stoi(token[p]);

}//try to convert to int

catch(invalid_argument&) {

num[p]=-1;

error=true;

} //catch

}//each of the 3 tokens

if(!error && validDate(num[0],num[1],num[2])) {

month=num[0];

day=num[1];

year=num[2];

} //no error

else {

month=day=1;

year=1970; //Unix time starting point

} //not valid: set to default valid date

for(int m=0;m<13;m++) days[m]=days2[m];

}//constructor with string such as "10/31/2016"

Date Date::operator=(const Date& otherDate) {

//assigns another instance of the date class to this.

month=otherDate.month;

day=otherDate.day;

year=otherDate.year;

return *this; //allows date1=date=date3;

}//overloaded operator =

Date Date::operator+(int numDays) {

//Adds the number of days to the Julian date.

Date other(month,day,year); //make copy of the date

int jd=other.julian(); //find the Julian date

jd+=numDays; //add the number of days to the Julian date

gregorian(jd,other.month,other.day,other.year); //Convert the Julian date back to Gregorian

if(other.leapYear()) days2[2]=29; else days2[2]=28;

for(int m=0;m<13;m++) other.days[m]=days2[m];

return other;

} //operator +

int Date::dayofYear() const {

//returns the day of the year, ie 2/1/???? is the 32 day of the year

int total=day;

for(int m=1;m

return total;

}//dayofYear

void gregorian(int julian, int &mth, int &d, int &y) {

//Fliegel-Van Flandern algorithm to convert Julian date to Gregorian month, day, and year

int p,q,r,s,t,u,v;

p = julian + 68569;

q = 4*p/146097;

r = p - (146097*q + 3)/4;

s = 4000*(r+1)/1461001;

t = r - 1461*s/4 + 31;

u = 80*t/2447;

v = u/11;

y = 100*(q-49)+s+v;

mth = u + 2 - 12*v;

d = t - 2447*u/80;

} //Gregorian

int Date::julian() const {

int jd= day-32075+1461*(year+4800+(month-14)/12)/4+

367*(month-2-(month-14)/12*12) /12-3*((year+4900+(month-14)/12)/100)/4;

return jd;

}

bool Date::leapYear() const {

bool leap=false;

if(year%4==0) leap=true;

if(year%100==0 && year%400!=0) leap=false;

return leap;

}//leapYear

bool leapYear(int yr) {

bool leap=false;

if(yr%4==0) leap=true;

if(yr%100==0 && yr%400!=0) leap=false;

return leap;

}//leapYear

int Date::weekday() const {

//returns 0 for Sunday, 1 for Monday, etc.

static int t[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };

int y =year;

y-= month < 3;

return ( y + y/4 - y/100 + y/400 + t[month-1] + day) % 7;

}//weekday

int Date::getMonth() const {

//private variables cannot be accessed directly but require "getter" functions

return month;

}//getMonth

int Date::getDay() const {

return day;

}//

int Date::getYear() const {

return year;

}//getYear

string Date::toString() const {

stringstream oss; //a stream to append the values

oss<

return oss.str();

}

bool Date::operator==(const Date& otherDate) {

return (month==otherDate.month && day==otherDate.day && year==otherDate.year);

}//operator ==

bool Date::operator<(const Date& otherDate) {

//A date is less than another date if is earlier

bool result=false; //assume false until proven true

if(year

else if(year==otherDate.year && month

else if(year==otherDate.year && month==otherDate.month && day

return result;

}//operator

bool Date::operator>(const Date& otherDate) {

//Convert both dates to Julian and compare the Julian dates

int jd1=julian();

int jd2=otherDate.julian();

return jd1>jd2;

}//operator

ostream& operator << (ostream &output, const Date &d) {

output << d.toString();

return output;

} // operator <<

istream& operator >> (istream &input, Date &d) {

string s;

input >> s;

Date other(s); //create a new Date

d=other; //assign the new Date to d

return input;

} // operator >>

Date Date::thanksGiving(int year)

{

Date turkeyDay(11, 01, year);

while (turkeyDay.weekday() != 4)

{

turkeyDay = turkeyDay + 1;

}

turkeyDay = turkeyDay + 21;

return turkeyDay;

}

// Date.h

#ifndef Date_H

#define Date_H

#include

#include

#include

#include

using namespace std;

class Date {

private:

int month, day, year;

int days[13];

public:

//constructors

Date(); //constructor for todays date

Date(int m, int d, int y); //constructor to assign date

Date(string str); //constructor for todays date as "mm/dd/year

Date(int gregorian); //constructor to convert a Gregorian date to Date

Date thanksGiving(int year); // Constructor for Thanks Giving

//methods

int getMonth() const; //returns the private variable month

int getDay() const; //returns the private variable day

int getYear() const; //returns the private variable year

string toString() const; //returns the string mm/dd/yyyy

bool leapYear() const; //determines if the year is a leap year

int dayofYear() const; //returns the day of the year: ie 2/1/???? is the 32 day of year

int julian() const;

int weekday() const; //returns 0 for Sunday, 1 for Monday, etc.

//overloaded operators

bool operator==(const Date& otherDate); //2 dates are equal if month, day and year are equal

bool operator<(const Date& otherDate); //a date is < another date if it is earlier

bool operator>(const Date& otherDate); //a date is > another date if it is later

Date operator=(const Date& otherDate); //let's you copy one date to another.

Date operator+(int); //Assign new values to the date after adding the number of days

friend ostream& operator << (ostream &output, const Date &d);

friend istream& operator >> (istream &input, Date &d);

};

bool validDate(int m, int d, int y); //test other date

bool leapYear(int y); //let's you test any year, not just the year for the instance

int julian(int m, int d, int y); //convert any date to Julian

void gregorian(int jd, int &mth, int &d, int &y);

static int days2[]={0,31,28,31,30,31,30,31,31,30,31,30,31};

#endif