Calendar - display name of specific date

[DekotaJoe]

So basically I need to make the program display the 10 input dates then calculate the day of the week. The program runs and I believe the algorithm and most of the functions are correct but I am having trouble getting it to display the name of the day after calculated.
For example;
"1/10/1900 - Wednesday"

I am sure its something fairly simple and I just can't see but any help would be appreciated.

  //Dekota Joe

#include <stdlib.h>
#include <iostream>
#include <fstream>
#include <string>

using namespace std;

bool leap(int);

class dateType
{
public:
	dateType();
	dateType(int, int, int);
	void setDate(int, int, int);
	void printDate(ostream&)const;

	friend ostream& operator <<(ostream &os, const dateType &d);
	friend istream& operator >>(istream &is, dateType &d);

protected:
	int month;
	int day;
	int year;

};

class nameDate : public dateType
{
public:
	nameDate();
	nameDate(int, int, int);
	nameDate(const nameDate&);
	void setDate(int, int, int);
	void setName();
	friend ostream &operator <<(ostream &, const nameDate &);
	friend istream &operator >>(istream &, const nameDate &);

protected:
	string name;
	void setName(string);

};

ostream& operator<<(ostream &os, const dateType &d) { 
	os << d.month << "/" << d.day << "/" << d.year;

	return os;
}


istream& operator >>(istream &is, dateType &d) {
	is >> d.month >> d.day >> d.year;

	return is;
}


ostream& operator<<(ostream &outFile, const nameDate &d)
{
	outFile << d.month << "/" << d.day << "/" << d.year << " - " << d.name;

	return outFile;
}

int main() {
		dateType d1;
		cout << "Testing default constructor..." << endl;
		d1.printDate(cout);

		cout << "\nTesting preset constructor..." << endl;
		dateType d2(9, 13, 2000);
		d2.printDate(cout);

		ofstream outFile;
		outFile.open("dateProgram.txt");

		if (outFile.fail()) {
			cout << "\n\nFailed to open \'dateProgram.txt\'\n" << endl;

			system("pause");
			return 0;
		}

		outFile << "Dekota Brown" << endl << endl;

		outFile << "\nTesting default constructor..." << endl;
		d1.printDate(outFile);

		outFile << "\nTesting preset constructor..." << endl;
		d2.printDate(outFile);

		cout << "\nTesting setDate..." << endl;
		outFile << "\nTesting setDate..." << endl;
		d1.setDate(3, 4, 1997);
		d1.printDate(cout);
		d1.printDate(outFile);

		cout << "\nTesting overloaded insertion operator..." << endl;
		dateType d(9, 11, 2001);
		cout << d;
		outFile << "\nTesting overloaded insertion operator..." << endl;
		outFile << d;

		ifstream inFile;
		inFile.open("inputDates.txt");
		
		if (inFile.fail()) {
			cout << "\n\nFailed to open \'inputDates.txt\'\n" << endl;

			system("pause");
			return 0;
		}
		
		cout << endl << endl;
		outFile << endl << endl;

		cout << "Testing name of date constructor..." << endl;
		outFile << "Testing name of date constructor..." << endl;

		cout << endl;
		
		for (int i = 0; i < 10; i++) {
			inFile >> d1;
			nameDate name;
			outFile << d1 << endl;
			cout << d1 << "\t" << name << endl;
		}

		outFile.close();
		inFile.close();

		cout << endl << endl;
		system("pause");
		
		return 0;
	}

	dateType::dateType() {
		month = 1;
		day = 1;
		year = 0000;
	}

	dateType::dateType(int myMonth, int myDay, int myYear) {
		month = myMonth;
		day = myDay;
		year = myYear;
	}

	void dateType::setDate(int myMonth, int myDay, int myYear) {
		month = myMonth;
		day = myDay;
		year = myYear;
	}

	void dateType::printDate(ostream& out)const {
		out << month << "/" << day << "/" << year << endl;
	}
	
	bool leap(int year)
	{
		return(year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
	}

	void nameDate::setName() {

		int total;

		total = year + year / 4 - year / 100 + year / 400 + 1;

		switch (month) {

		case 1:
		case 10:
			break;

		case 2:
		case 3:
		case 11: total = total + 3;
			break;

		case 5: total = total + 1;
			break;

		case 8: total = total + 2;
			break;

		case 6: total = total + 4;
			break;

		case 9:
		case 12: total = total + 5;
			break;

		case 7:
		case 4: total = total + 6;
			break;
		}

		if (month < 3 && leap(year))
			total--;

		total = total + (day - 1);

		total = total % 7;

		switch (total) {
		case 0: name = "Saturday";
			break;
		case 1: name = "Sunday";
			break;
		case 2: name = "Monday";
			break;
		case 3: name = "Tuesday";
			break;
		case 4: name = "Wednesday";
			break;
		case 5: name = "Thursday";
			break;
		case 6: name = "Friday";
			break;
		}
	}

void nameDate::setDate(int m, int d, int y) {
	month = m;
	day = d;
	year = y;
	setName();
}

nameDate::nameDate() {
	month = 1;
	day = 1;
	year = 0000;
	name = "Saturday";
}

inputDates.txt
1 10 1900
3 16 1900
2 2 1944
1 1 2004
2 29 2004
12 24 2002
7 2 2050
3 23 2004
1 6 1812
2 3 1800

[Duthomhas]

On line 127 you create a nameDate object, but you never initialize it with the date you got from file.

I'm not sure, exactly, why you have a separate class for that; the dateType class should be able to tell you what day of week it is.

If you do keep it separate, you should probably make it possible to take a dateType class as argument to the constructor/setter of the nameDate class. And you probably ought to make some accessors to get the year, month, and day values out of a dateType.

For reference, the simplest algorithm to get the weekday in the Gregorian system is:

// http://www.faqs.org/faqs/calendars/faq/part1/index.html
unsigned day_of_week( unsigned year, unsigned month, unsigned day )
{
  unsigned a, y, m;
  a = (14 - month) / 12;
  y = year - a;
  m = month + (12 * a) - 2;
  // Gregorian:
  return (day + y + (y / 4) - (y / 100) + (y / 400) + ((31 * m) / 12)) % 7;
}

You can use that as an index into an array listing the weekday names:

  std::string weekday_names[] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
  std::string weekday_name = weekday_names[ d1.dayOfWeek() ];

Hope this helps.