Trouble Overloading Operators: DayOfYear

[blairtch]

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

When 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.

Also, 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.

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

Any help or advice would be appreciated. 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;
}

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();
}

DayOfYear::DayOfYear(int d)
{
    day = d;

    while (d > 365 || d < 1) {
        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 overloaded prefix increment operator is called is: ";
    ++day;
    print();

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

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

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




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){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
            }
        else if (m == months[1] && d > 28){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
            }
        else if (m == months[2] && d > 31){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if (m == months[3] && d > 30){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if (m == months[4] && d > 31){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if (m == months[5] && d > 30){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if(m == months[6] && d > 31){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if (m == months[7] && d > 31){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if(m == months[8] && d > 30){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if(m == months[9] && d > 31){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if(m == months[10] && d > 30){
            cout << "Invalid input, terminating program." << endl;
                exit(0);
        }
        else if(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 overloaded prefix increment operator is called is: " << ++dayOfYear;

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

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

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

}



void DayOfYear::print() {
    if( day > 366){
        cout << "Invalid input, terminating program. Day is greater than 365." << endl;
        exit(0);
    }
    else if( day < 0){
        cout << "Invalid input, terminating program. Day is less than 1." << endl;
        exit(0);
    }
    else 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;
}