Help Overloading Increment/Decrement Operators?

[blairtch]

I posted this here before with no luck but I am completely stuck. Any hints or guidance would be much appreciated.

My program has two constructors. One takes number 1-365 and returns month and day of year, and another takes a month and day as parameters and returns the day of year 1-365. I also need to overload the postfix/prefix increment/decrement operators.

My problem is in the two arg constructor when I print out the date after the increment/decrement operators are called it is changing the original value instead of the new value.

Also the date is December 31, and it is incremented its not incrementing to January 1. Nor will it decrement to Dec. 31 from Jan 1.

Can anyone provide me a hint as to what I'm missing or doing wrong?

Thank you!

  #include<iostream>
#include<string>
#include <cstdlib>

using namespace std;

class DayOfYear
{
    private:

        static string month;
        static string months[12];

    public:
        int day;
        DayOfYear();
        DayOfYear(int d);
        DayOfYear(string m, int d);

        void print();

        DayOfYear& operator++();
        DayOfYear operator++(int);
        DayOfYear& operator--();
        DayOfYear operator--(int);
};

string DayOfYear::month;
string DayOfYear::months[12] =
{"January", "February", "March", "April", "May", "June", "July", "August","September", "October","November", "December"};

//Overloaded Operators
DayOfYear& DayOfYear::operator++()
{
	if (this->day == 365)
		this->day = 1;
	else
		this->day++;
	return *this;
}

DayOfYear DayOfYear::operator++(int)
{
	DayOfYear tmp(*this);
	operator++();
	return tmp;
}

DayOfYear& DayOfYear::operator--()
{
	if (this->day == 1)
		this->day = 365;
	else
		this->day--;
	return *this;
}

DayOfYear DayOfYear::operator--(int)
{
	DayOfYear tmp(*this);
	operator--();
	return tmp;
}


//Constructor
DayOfYear::DayOfYear()
{
    cout << "Enter the a day of the year (1-365), to print out the month and day\n"
     "or enter a number <=0 to end:" << endl;
    cin >> day;
    print();
}


//Constructor integer arg
DayOfYear::DayOfYear(int d)
{
    day = d;

    while (d > 366 || d < 0) {
        cout << "Day cannot be > 365 or < 1. " << endl << endl;
        cout << "Reenter a day 1-365:";
        cin >> d;
        day = d;
    }

    cout << "Day number " << day << " of the year is: ";
    print();

    cout << endl<< "The day after the prefix increment operator is called is: ";
    ++day;
    print();

    cout << endl << "The day after the postfix increment operator is called is: ";
    day++;
    print();

    cout << endl << "The day after the prefix decrement operator is called is: ";
    --day;
    print();

    cout << endl << "The day after the postfix decrement operator is called is: ";
    day--;
    print();
}



//Two arg constructor
DayOfYear::DayOfYear(string m, int d) {
    month = m;
    day = d;
    int dayOfYear;


    if (m == months[0])
    {
        dayOfYear = d;
    }
     else if (m == months[1])
    {
        dayOfYear = (d + 31);
    }
     else if (m == months[2])
    {
        dayOfYear = (d + 59);
    }
    else if (m == months[3])
    {
        dayOfYear = (d + 90);
    }
    else if (m == months[4])
    {
        dayOfYear = (d + 120);
    }
    else if (m == months[5])
    {
        dayOfYear = (d + 151);
    }
    else if (m == months[6])
    {
        dayOfYear = (d + 181);
    }
    else if (m == months[7])
    {
        dayOfYear = (d + 212);
    }
    else if (m == months[8])
    {
        dayOfYear = (d + 243);
    }
    else if (m == months[9])
    {
        dayOfYear = (d + 273);
    }
    else if (m == months[10])
    {
        dayOfYear = (d + 304);
    }
    else if (m == months[11])
    {
        dayOfYear = (d + 334);
    }

        if ((m == months[0] && d > 31)|| (m == months[1] && d > 28)|| (m == months[2] && d > 31)|| (m == months[3] && d > 30)
            ||(m == months[4] && d > 31)||(m == months[5] && d > 30)||(m == months[6] && d > 31)||(m == months[7] && d > 31)||
            (m == months[8] && d > 30)||(m == months[9] && d > 31)||(m == months[10] && d > 30)||(m == months[11] && d > 31)){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if (d <=0){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }


    cout << month << " " << day << " is day number " << dayOfYear << " of the year." <<endl;


    cout << endl<< "The day of the year after the prefix increment operator is called is: " << ++dayOfYear;
    cout << endl << "The day of year after the postfix increment operator is called is: " << dayOfYear++;
    cout << endl << "The day of year after the prefix decrement operator is called is: " << --dayOfYear;
    cout << endl << "The day of year after the postfix decrement operator is called is:" << dayOfYear-- << endl;

}



void DayOfYear::print() {
    if (day > 0 && day < 32)
    {
        month = months[0];
        cout << month << " " << 31 + day - 31 << endl;
    }
    else if (day > 31 && day < 60)
    {
        month = months[1];
        cout << month << " " << day - 31  << endl;
    }
    else if (day > 59 && day < 91)
    {
        month = months[2];
        cout << month << " " << day - 59 << endl;
    }
    else if (day > 90 && day < 121)
    {
        month = months[3];
        cout << month << " " << day - 90 << endl;
    }
    else if (day > 120 && day < 152)
    {
        month = months[4];
        cout << month << " " << day - 120 << endl;
    }
    else if (day > 151 && day < 182)
    {
        month = months[5];
        cout << month << " " << day - 151 << endl;
    }
    else if (day > 181 && day < 213)
    {
        month = months[6];
        cout << month << " " << day - 181 << endl;
    }
    else if (day > 212 && day < 244)
    {
        month = months[7];
        cout << month << " " << day - 212 << endl;
    }
    else if (day > 243 && day < 274)
    {
        month = months[8];
        cout << month << " " << day - 243 << endl;
    }
    else if (day > 273 && day < 305)
    {
        month = months[9];
        cout << month << " " << day - 273 << endl;
    }
    else if (day > 304 && day < 335)
    {
        month = months[10];
        cout << month << " " << day - 304  << endl;
    }
    else if (day > 334 && day < 366)
    {
        month = months[11];
        cout << month << " " << day - 334 << endl;
    }

}

int main()
{

    int input;
    string month;
    int day;

    cout << "Enter a number 1-365 to see the corresponding day of the year.";
    cin >> input;

    DayOfYear * dayOfYear1 = new DayOfYear(input);


    cout << endl << endl;
    cout << "Now enter a month and day to see the corresponding day number." << endl;
    cout << "First enter the month:";
    cin >> month;
    cout << endl << "Now enter the day: ";
    cin >> day;

    DayOfYear * dayOfYear2 = new DayOfYear(month, day);


    system("PAUSE");
    return 0;
}