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C++ || How To Find The Day Of The Week You Were Born Using C++

February 06, 2021 admin No comments

The following is a program which demonstrates how to find the day of week you were born using C++.

The program demonstrated on this page is an updated version of a previous program of the same type.

REQUIRED KNOWLEDGE FOR THIS PROGRAM

Zeller's congruence #include Utils.h A Calendar

1. Overview

This program prompts the user for their name, date of birth (month, day, year), and then displays information back to them via cout. Once the program obtains selected information from the user, it will use simple math to determine the day of the week in which the user was born, and determine the day of the week their current birthday will be for the current calendar year. The program will also display to the user their current age, along with re-displaying their name back to them.

2. When Were You Born?

Note: This program uses functions in a custom .h header file #include “Utils.h”. To obtain the code for that file, click here.





		
		
			When Were You Born?
			
C++
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 12, 2012
//    Updated: Feb 6, 2021
//    Taken From: http://programmingnotes.org/
//    File:  dateOfWeek.cpp
//    Description: Simple program to determine the day of week for a date
// ============================================================================
#include <iostream>
#include <string>
#include <exception>
#include "Utils.h"

// Function prototypes
std::string getMonthName(int month);
void validate(int value, int lower, int upper, const std::string& desc);

// A const variable containing the current year
const int CURRENT_YEAR = 2021;

int main() {
    try {
        // Declare variables
        std::string userName = "";
        int month = 0;
        int day = 0;
        int year = 0;

        // Get user input
        std::cout << "Please enter your name: ";
        std::getline(std::cin, userName);

        // Get month born
        std::cout << "\nPlease enter the month in which you were born (between 1 and 12): ";
        std::cin >> month;

        // Validate correct month range
        validate(month, 1, 12, "month");

        // Get day born
        std::cout << "\nPlease enter the day you were born (between 1 and 31): ";
        std::cin >> day;

        // Validate correct birth date range
        validate(day, 1, 31, "birth date");

        // Get year born
        std::cout << "\nPlease enter the year you were born: ";
        std::cin >> year;

        // Get the month name
        auto monthName = getMonthName(month);

        // Get the week name
        auto weekdayName = Utils::getWeekdayName(day, month, year);

        // display data to user
        std::cout << "\nHello " << userName 
            << ". Here are some facts about you!" << std::endl;
        std::cout << "You were born " 
            << monthName << " " << day << " " << year << std::endl;
        std::cout << "Your birth took place on a " 
            << weekdayName << std::endl;
        std::cout << "This year (" << CURRENT_YEAR 
            << ") your birthday will take place on a "
            << Utils::getWeekdayName(day, month, CURRENT_YEAR) << std::endl;
        std::cout << "You currently are, or will be " << (CURRENT_YEAR - year) 
            << " years old this year!" << std::endl;

    } catch (std::exception& e) {
        std::cout << "\nAn error occurred: " + std::string(e.what()) << std::endl;
    }

    std::cin.get();
    return 0;
}

/**
* FUNCTION: getMonthName 
* USE: Returns the name of the month for the given paremeters 
*   (i.e month #1 = January)
* @param month: The month
* @return: The name of the month for the given parameters
*/
std::string getMonthName(int month) {
    std::string months[] = {"January", "February", "March", "April", "May",
        "June", "July", "August", "September", "October", "November", "December"};
    return months[month - 1];
}

void validate(int value, int lower, int upper, const std::string& desc) {
    if (value < lower || value > upper) {
        throw std::invalid_argument{ "Invalid " + desc + " entered: '" + std::to_string(value) + "'" };
    }
}// http://programmingnotes.org/
			
				
					
				
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						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 12, 2012
//    Updated: Feb 6, 2021
//    Taken From: http://programmingnotes.org/
//    File:  dateOfWeek.cpp
//    Description: Simple program to determine the day of week for a date
// ============================================================================
#include <iostream>
#include <string>
#include <exception>
#include "Utils.h"
 
// Function prototypes
std::string getMonthName(int month);
void validate(int value, int lower, int upper, const std::string& desc);
 
// A const variable containing the current year
const int CURRENT_YEAR = 2021;
 
int main() {
    try {
        // Declare variables
        std::string userName = "";
        int month = 0;
        int day = 0;
        int year = 0;
 
        // Get user input
        std::cout << "Please enter your name: ";
        std::getline(std::cin, userName);
 
        // Get month born
        std::cout << "\nPlease enter the month in which you were born (between 1 and 12): ";
        std::cin >> month;
 
        // Validate correct month range
        validate(month, 1, 12, "month");
 
        // Get day born
        std::cout << "\nPlease enter the day you were born (between 1 and 31): ";
        std::cin >> day;
 
        // Validate correct birth date range
        validate(day, 1, 31, "birth date");
 
        // Get year born
        std::cout << "\nPlease enter the year you were born: ";
        std::cin >> year;
 
        // Get the month name
        auto monthName = getMonthName(month);
 
        // Get the week name
        auto weekdayName = Utils::getWeekdayName(day, month, year);
 
        // display data to user
        std::cout << "\nHello " << userName 
            << ". Here are some facts about you!" << std::endl;
        std::cout << "You were born " 
            << monthName << " " << day << " " << year << std::endl;
        std::cout << "Your birth took place on a " 
            << weekdayName << std::endl;
        std::cout << "This year (" << CURRENT_YEAR 
            << ") your birthday will take place on a "
            << Utils::getWeekdayName(day, month, CURRENT_YEAR) << std::endl;
        std::cout << "You currently are, or will be " << (CURRENT_YEAR - year) 
            << " years old this year!" << std::endl;
 
    } catch (std::exception& e) {
        std::cout << "\nAn error occurred: " + std::string(e.what()) << std::endl;
    }
 
    std::cin.get();
    return 0;
}
 
/**
* FUNCTION: getMonthName 
* USE: Returns the name of the month for the given paremeters 
*   (i.e month #1 = January)
* @param month: The month
* @return: The name of the month for the given parameters
*/
std::string getMonthName(int month) {
    std::string months[] = {"January", "February", "March", "April", "May",
        "June", "July", "August", "September", "October", "November", "December"};
    return months[month - 1];
}
 
void validate(int value, int lower, int upper, const std::string& desc) {
    if (value < lower || value > upper) {
        throw std::invalid_argument{ "Invalid " + desc + " entered: '" + std::to_string(value) + "'" };
    }
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Once compiled, you should get this as your output:
Note: The code was compiled four separate times to display the different outputs its able to produce

Please enter your name: My Programming Notes Please enter the month in which you were born (between 1 and 12): 1 Please enter the day you were born (between 1 and 31): 1 Please enter the year you were born: 2012
Hello My Programming Notes. Here are some facts about you! You were born January 1 2012 Your birth took place on a Sunday This year (2021) your birthday will take place on a Friday You currently are, or will be 9 years old this year! --------------------------------------------------------------------- Please enter your name: Jennifer Please enter the month in which you were born (between 1 and 12): 1 Please enter the day you were born (between 1 and 31): 27 Please enter the year you were born: 1991 Hello Jennifer. Here are some facts about you! You were born January 27 1991 Your birth took place on a Sunday This year (2021) your birthday will take place on a Wednesday You currently are, or will be 30 years old this year! --------------------------------------------------------------------- Please enter your name: Kenneth Please enter the month in which you were born (between 1 and 12): 7 Please enter the day you were born (between 1 and 31): 28 Please enter the year you were born: 1987 Hello Kenneth. Here are some facts about you! You were born July 28 1987 Your birth took place on a Tuesday This year (2021) your birthday will take place on a Wednesday You currently are, or will be 34 years old this year! ---------------------------------------------------------------------
Please enter your name: Name Please enter the month in which you were born (between 1 and 12): 12 Please enter the day you were born (between 1 and 31): 35 An error occurred: Invalid birth date entered: '35'

C++ || Struct – Add One Day To Today’s Date Using A Struct

January 18, 2012 admin No comments

This program displays more practice using the structure data type, and is very similar to another program which was previously discussed here.

REQUIRED KNOWLEDGE FOR THIS PROGRAM

Functions Passing a Value By Reference Integer Arrays Structures Constant Variables Boolean Expressions

This program utilizes a struct, which is very similar to the class concept. This program first prompts the user to enter the current date in mm/dd/yyyy format. Upon obtaining the date from the user, the program then uses a struct implementation to simply add one day to the date which was entered by the user. If the day that was entered into the program by the user falls on the end of the month, the program will”roll over” the incremented date into the next month. If the user enters 12/31/2012, the program will “roll over” the incremented date into the next calendar year.

NOTE: On some compilers, you may have to add #include < cstdlib> in order for the code to compile.





		
		
			Whats Today's Date?
			
C++
			
			#include <iostream> 
using namespace std;

// struct declaration
struct Date
{
	int month;
	int day;
	int year;
};

// constants which do not change
// specifies the max values for each variable
const int MAX_DAYS = 31;
const int MAX_MONTHS = 12; 

// function prototypes
bool IsDateValid(Date dateVal);
void CalcNextDay(Date &dateVal);

int main()
{
	// initialize the structure: month, day, year
	Date dateVal = {1,18,2012};
	char backSlash = '/'; // this is a 'placeholder' variable
	
	// obtain information from user
	cout << "Please enter today's date in mm/dd/yyyy format: ";
	cin >> dateVal.month >> backSlash >> dateVal.day >> backSlash >> dateVal.year;
	
	// Checks to see if user entered valid data
	if (IsDateValid(dateVal) == false)
	{
		cout << "Invalid input...nProgram exiting...." << endl;
		exit(EXIT_FAILURE);
	} 
	
	// function declaration which calculates the next day
	CalcNextDay(dateVal);

	// display updated data to user
	cout << "The next day is " << dateVal.month << "/" << dateVal.day << "/" << dateVal.year <<endl; 
	
	return 0;
}// end of main

	// this function checks to see if the user inputted valid data
bool IsDateValid(Date dateVal)
{
     // checks to see if user inputted data falls between the specified
     // const variables as declared above
     if ((dateVal.day >= 1 && dateVal.day <= MAX_DAYS)
          &&(dateVal.month >= 1 && dateVal.month <= MAX_MONTHS))
     {
          return true;
     }
     else
     {
          return false;
     }
}// end of IsDateValid 

	// this calculates the next day & updates values via reference
void CalcNextDay(Date &dateVal)
{
	// int array which holds the max date each month has
	// from January to December
	int maxDays[12]={31,28,31,30,31,30,31,31,30,31,30,31};
	
	// bool which lets the program know if the month the
	// user entered is a max month for the specific month
	// the user inputted
	bool maxDay = false;
	
	// checks to see if user inputted day is a max date from the 
	// above array for the currently selected month which 
	// was entered by the user
	if(dateVal.day == maxDays[dateVal.month-1])
	{
		dateVal.day = 1;
		++dateVal.month;
		maxDay = true;
	}

	// checks to see if user inputted a valid date
	// for the currently selected month
	else if (dateVal.day > maxDays[dateVal.month-1])
	{
		cout << "Invalid day input - There is no such date for the selected month.nProgram exiting...." << endl;
		exit(EXIT_FAILURE);
	} 

	// if user didnt enter a max date, and the date is valid, increment the day
	else
	{
		++dateVal.day;
	}

	// if the date is 12/31/yyyy
	// increment to the next year
	if ((dateVal.month > 12)  && maxDay == true)
	{
		dateVal.month = 1;
		++dateVal.year;
	}
}// http://programmingnotes.org/
			
				
					
				
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						#include <iostream> 
using namespace std;
 
// struct declaration
struct Date
{
	int month;
	int day;
	int year;
};
 
// constants which do not change
// specifies the max values for each variable
const int MAX_DAYS = 31;
const int MAX_MONTHS = 12; 
 
// function prototypes
bool IsDateValid(Date dateVal);
void CalcNextDay(Date &dateVal);
 
int main()
{
	// initialize the structure: month, day, year
	Date dateVal = {1,18,2012};
	char backSlash = '/'; // this is a 'placeholder' variable
	
	// obtain information from user
	cout << "Please enter today's date in mm/dd/yyyy format: ";
	cin >> dateVal.month >> backSlash >> dateVal.day >> backSlash >> dateVal.year;
	
	// Checks to see if user entered valid data
	if (IsDateValid(dateVal) == false)
	{
		cout << "Invalid input...nProgram exiting...." << endl;
		exit(EXIT_FAILURE);
	} 
	
	// function declaration which calculates the next day
	CalcNextDay(dateVal);
 
	// display updated data to user
	cout << "The next day is " << dateVal.month << "/" << dateVal.day << "/" << dateVal.year <<endl; 
	
	return 0;
}// end of main
 
	// this function checks to see if the user inputted valid data
bool IsDateValid(Date dateVal)
{
     // checks to see if user inputted data falls between the specified
     // const variables as declared above
     if ((dateVal.day >= 1 && dateVal.day <= MAX_DAYS)
          &&(dateVal.month >= 1 && dateVal.month <= MAX_MONTHS))
     {
          return true;
     }
     else
     {
          return false;
     }
}// end of IsDateValid 
 
	// this calculates the next day & updates values via reference
void CalcNextDay(Date &dateVal)
{
	// int array which holds the max date each month has
	// from January to December
	int maxDays[12]={31,28,31,30,31,30,31,31,30,31,30,31};
	
	// bool which lets the program know if the month the
	// user entered is a max month for the specific month
	// the user inputted
	bool maxDay = false;
	
	// checks to see if user inputted day is a max date from the 
	// above array for the currently selected month which 
	// was entered by the user
	if(dateVal.day == maxDays[dateVal.month-1])
	{
		dateVal.day = 1;
		++dateVal.month;
		maxDay = true;
	}
 
	// checks to see if user inputted a valid date
	// for the currently selected month
	else if (dateVal.day > maxDays[dateVal.month-1])
	{
		cout << "Invalid day input - There is no such date for the selected month.nProgram exiting...." << endl;
		exit(EXIT_FAILURE);
	} 
 
	// if user didnt enter a max date, and the date is valid, increment the day
	else
	{
		++dateVal.day;
	}
 
	// if the date is 12/31/yyyy
	// increment to the next year
	if ((dateVal.month > 12)  && maxDay == true)
	{
		dateVal.month = 1;
		++dateVal.year;
	}
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Once compiled, you should get this as your output:
Note: The code was compiled 6 separate times to display the different outputs its able to produce

Please enter today's date in mm/dd/yyyy format: 1/18/2012 The next day is 1/19/2012 -------------------------------------------------------------------
Please enter today's date in mm/dd/yyyy format: 7/31/2012 The next day is 8/1/2012 ------------------------------------------------------------------- Please enter today's date in mm/dd/yyyy format: 2/28/2012 The next day is 3/1/2012 ------------------------------------------------------------------- Please enter today's date in mm/dd/yyyy format: 13/5/2012 Invalid input... Program exiting.... ------------------------------------------------------------------- Please enter today's date in mm/dd/yyyy format: 2/31/2012 Invalid day input - There is no such date for the selected month. Program exiting.... -------------------------------------------------------------------
Please enter today's date in mm/dd/yyyy format: 12/31/2012 The next day is 1/1/2013

C++ || Find The Day Of The Week You Were Born Using Functions, String, Modulus, If/Else, & Switch

January 12, 2012 admin No comments

Click Here For Updated Version Of Program

This program displays more practice using functions, modulus, if and switch statements.

REQUIRED KNOWLEDGE FOR THIS PROGRAM

Functions Strings Modulus If/Else Statements Switch Statements Knowledge of Leap Years A Calendar

NOTE: On some compilers, you may have to add #include < cstdlib> in order for the code to compile.





		
		
			When Were You Born?
			
C++
			
			#include <iostream>
#include <string>
using namespace std;

// a const variable containing the current year
const int CURRENT_YEAR = 2012;

// function prototypes
string GetNameOfMonth(int numOfMonth);
int GetLastTwoDigits(int fourDigitYear);
string GetDayOfWeek(int numOfMonth, int lastTwoDigits, int numOfDay, int fourDigitYear);

int main ()
{
	// declare variables
	string nameOfMonth = " ", dayOfWeek = " ", userName = " ", dayOfWeekCurrentYear = " " ;
	int numOfMonth=0, numOfDay=0, fourDigitYear=0, lastTwoDigits=0, lastTwoDigitsCurrentYear;
	
	// user inputs data
	cout << "Please enter your name: ";
	cin >> userName;

	cout << "nPlease enter the month in which you were born (between 1 and 12): ";
	cin >> numOfMonth;

	// converts the number the user inputted from above ^ 
	// into a literal month name (i.e month #1 = January)
	nameOfMonth = GetNameOfMonth(numOfMonth);
	
	// user inputs data
	cout << "nPlease enter the day you were born (between 1 and 31): ";
	cin >> numOfDay;
	
	// checks to see if user entered valid data 
	if (numOfDay < 1 || numOfDay > 31)
	{
		cout << "nYou have entered an invalid number of day. "
			<< "Please enter a valid number." << endl << endl;
		exit(1);
	}
	
	// user inputs data
	cout << "nPlease enter the year you were born (between 1900 and 2099): ";
	cin >>  fourDigitYear;
	cout << endl << endl;
	
	// checks to see if user entered valid data 
	if (fourDigitYear < 1900 || fourDigitYear > 2099)
	{
		cout << "You have entered an invalid year. "
			<< "Please enter a valid year." << endl << endl;
		exit(1);
	}
	
	// gets the las two digits in which the user was born
	// (i.e 1999: last two digits = 99)
	lastTwoDigits = GetLastTwoDigits(fourDigitYear);

	// gets the las two digits of the current year
	// (i.e 2012: last two digits = 12)
	lastTwoDigitsCurrentYear = GetLastTwoDigits(CURRENT_YEAR);

	// finds the day of the week in which the user was born
	dayOfWeek = GetDayOfWeek(numOfMonth, lastTwoDigits, numOfDay, fourDigitYear);

	// finds the day of the week the users current birthday will be this year
	dayOfWeekCurrentYear = GetDayOfWeek(numOfMonth, lastTwoDigitsCurrentYear, numOfDay, CURRENT_YEAR);
	
	// display data to user
	cout << "Hello " << userName <<". Here are some facts about you!" <<endl;
	cout << "You were born "<< nameOfMonth << numOfDay << " "<< fourDigitYear << endl;
	cout << "Your birth took place on a " << dayOfWeek << endl;
	cout << "This year your birthday will take place on a " << dayOfWeekCurrentYear << endl;
	cout << "You currently are, or will be " << (CURRENT_YEAR - fourDigitYear) << " years old this year!"<<endl;
	
	return 0;
}// end of main

	// converts the number the user inputted from above ^ 
	// into a literal month name (i.e month #1 = January)
string GetNameOfMonth(int numOfMonth)
{
	string nameOfMonth = " ";

	// a switch determining what month the user was born
	switch(numOfMonth)
	{
	case 1:
			nameOfMonth = "January ";
			break;
	case 2:
			nameOfMonth = "February ";
			break;
	case 3:
			nameOfMonth = "March ";
			break;
	case 4:
			nameOfMonth = "April ";
			break;
	case 5:
			nameOfMonth = "May ";
			break;
	case 6:
			nameOfMonth = "June ";
			break;
	case 7: 
			nameOfMonth = "July ";
			break;
	case 8:
			nameOfMonth = "August ";
			break;
	case 9:
			nameOfMonth = "September ";
			break;
	case 10:
			nameOfMonth = "October ";
			break;
	case 11:
			nameOfMonth = "November ";
			break;
	case 12:
			nameOfMonth = "December ";
			break;
	default:
			cout << "You have entered an invalid number of month. nPlease enter a valid number.n"
				<< "Program Terminating..";
			exit(1);
			break;
	}// end of switch

	return nameOfMonth ;
}// end of GetNamOfMonth

	// gets the las two digits in which the user was born/current year
int GetLastTwoDigits(int fourDigitYear)
{
	if (fourDigitYear >= 1900 && fourDigitYear <= 1999)
	{ 
		return (fourDigitYear - 1900);
	}
	
	else
	{
		return (fourDigitYear - 2000);
	}
}// end of GetLastTwoDigits

	// finds the day of the week in which the user was born/current year
string GetDayOfWeek(int numOfMonth, int lastTwoDigits, int numOfDay, int fourDigitYear)
{
	string dayOfWeek = " ";
	int Total = 0, valueOfMonth = 0;

	if (numOfMonth == 1)
                valueOfMonth = 1;
	else if (numOfMonth == 2)
                valueOfMonth = 4;
	else if (numOfMonth == 3)
                valueOfMonth = 4;
	else if (numOfMonth == 4)
                valueOfMonth = 0;
	else if (numOfMonth == 5)
                valueOfMonth = 2;
	else if (numOfMonth == 6)
                valueOfMonth = 5;
	else if (numOfMonth == 7)
                valueOfMonth = 0;
	else if (numOfMonth == 8)
                valueOfMonth = 3;
	else if (numOfMonth == 9)
                valueOfMonth = 6;
	else if (numOfMonth == 10)
                valueOfMonth = 1;
	else if (numOfMonth == 11)
                valueOfMonth = 4;
	else if (numOfMonth == 12)
                valueOfMonth = 6;
	else
		cout <<"nError";
	
	Total = lastTwoDigits / 4;
	Total += lastTwoDigits;
	Total += numOfDay;
	Total += valueOfMonth;
	
	// uses the 'Total' variable from above to determine the day 
	// of the week in which you were born
	if ((fourDigitYear > 2000)&&((numOfMonth != 1)&&(numOfMonth != 2))&&(fourDigitYear != 2004))
	{ 
		Total = Total + 6;
	}
	else  if ((fourDigitYear < 2000) && ((numOfMonth == 1) || (numOfMonth == 2)))
	{ 
		Total = Total + 7;
	}
	else if ((fourDigitYear == 2000) && ((numOfMonth == 1) || (numOfMonth == 2)))
	{
		Total = Total -2;
	}
	else if ((fourDigitYear == 2004||fourDigitYear == 2000)&&((numOfMonth != 1)&&(numOfMonth != 2)))
	{
		Total = Total -1;
	}
	else if ((fourDigitYear % 4 == 0) && (fourDigitYear % 100 == lastTwoDigits) && (fourDigitYear % 400 == lastTwoDigits))
	{
		Total = Total-2;
	}
	else if ((fourDigitYear > 2000)&&((numOfMonth == 1)||(numOfMonth == 2))&&(fourDigitYear != 2004))
	{
		Total = Total + 6;
	}

	// uses the 'Total' variable from above to determine the day 
	// of the week in which you were born/when you birthday will be this year
	if (Total % 7 == 1)
                dayOfWeek = "Sunday";
	else if (Total % 7 == 2)
                dayOfWeek = "Monday";
	else if (Total % 7 == 3)
                dayOfWeek = "Tuesday";
	else  if (Total % 7 == 4)
                dayOfWeek = "Wednesday";
	else if (Total % 7 == 5)
                dayOfWeek = "Thursday";
	else if (Total % 7 == 6)
                dayOfWeek = "Friday";
	else if (Total % 7 == 0)
                dayOfWeek = "Saturday";
	else
		cout<< "nError";

	return dayOfWeek;
}// http://programmingnotes.org/
			
				
					
				
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						#include <iostream>
#include <string>
using namespace std;
 
// a const variable containing the current year
const int CURRENT_YEAR = 2012;
 
// function prototypes
string GetNameOfMonth(int numOfMonth);
int GetLastTwoDigits(int fourDigitYear);
string GetDayOfWeek(int numOfMonth, int lastTwoDigits, int numOfDay, int fourDigitYear);
 
int main ()
{
	// declare variables
	string nameOfMonth = " ", dayOfWeek = " ", userName = " ", dayOfWeekCurrentYear = " " ;
	int numOfMonth=0, numOfDay=0, fourDigitYear=0, lastTwoDigits=0, lastTwoDigitsCurrentYear;
	
	// user inputs data
	cout << "Please enter your name: ";
	cin >> userName;
 
	cout << "nPlease enter the month in which you were born (between 1 and 12): ";
	cin >> numOfMonth;
 
	// converts the number the user inputted from above ^ 
	// into a literal month name (i.e month #1 = January)
	nameOfMonth = GetNameOfMonth(numOfMonth);
	
	// user inputs data
	cout << "nPlease enter the day you were born (between 1 and 31): ";
	cin >> numOfDay;
	
	// checks to see if user entered valid data 
	if (numOfDay < 1 || numOfDay > 31)
	{
		cout << "nYou have entered an invalid number of day. "
			<< "Please enter a valid number." << endl << endl;
		exit(1);
	}
	
	// user inputs data
	cout << "nPlease enter the year you were born (between 1900 and 2099): ";
	cin >>  fourDigitYear;
	cout << endl << endl;
	
	// checks to see if user entered valid data 
	if (fourDigitYear < 1900 || fourDigitYear > 2099)
	{
		cout << "You have entered an invalid year. "
			<< "Please enter a valid year." << endl << endl;
		exit(1);
	}
	
	// gets the las two digits in which the user was born
	// (i.e 1999: last two digits = 99)
	lastTwoDigits = GetLastTwoDigits(fourDigitYear);
 
	// gets the las two digits of the current year
	// (i.e 2012: last two digits = 12)
	lastTwoDigitsCurrentYear = GetLastTwoDigits(CURRENT_YEAR);
 
	// finds the day of the week in which the user was born
	dayOfWeek = GetDayOfWeek(numOfMonth, lastTwoDigits, numOfDay, fourDigitYear);
 
	// finds the day of the week the users current birthday will be this year
	dayOfWeekCurrentYear = GetDayOfWeek(numOfMonth, lastTwoDigitsCurrentYear, numOfDay, CURRENT_YEAR);
	
	// display data to user
	cout << "Hello " << userName <<". Here are some facts about you!" <<endl;
	cout << "You were born "<< nameOfMonth << numOfDay << " "<< fourDigitYear << endl;
	cout << "Your birth took place on a " << dayOfWeek << endl;
	cout << "This year your birthday will take place on a " << dayOfWeekCurrentYear << endl;
	cout << "You currently are, or will be " << (CURRENT_YEAR - fourDigitYear) << " years old this year!"<<endl;
	
	return 0;
}// end of main
 
	// converts the number the user inputted from above ^ 
	// into a literal month name (i.e month #1 = January)
string GetNameOfMonth(int numOfMonth)
{
	string nameOfMonth = " ";
 
	// a switch determining what month the user was born
	switch(numOfMonth)
	{
	case 1:
			nameOfMonth = "January ";
			break;
	case 2:
			nameOfMonth = "February ";
			break;
	case 3:
			nameOfMonth = "March ";
			break;
	case 4:
			nameOfMonth = "April ";
			break;
	case 5:
			nameOfMonth = "May ";
			break;
	case 6:
			nameOfMonth = "June ";
			break;
	case 7: 
			nameOfMonth = "July ";
			break;
	case 8:
			nameOfMonth = "August ";
			break;
	case 9:
			nameOfMonth = "September ";
			break;
	case 10:
			nameOfMonth = "October ";
			break;
	case 11:
			nameOfMonth = "November ";
			break;
	case 12:
			nameOfMonth = "December ";
			break;
	default:
			cout << "You have entered an invalid number of month. nPlease enter a valid number.n"
				<< "Program Terminating..";
			exit(1);
			break;
	}// end of switch
 
	return nameOfMonth ;
}// end of GetNamOfMonth
 
	// gets the las two digits in which the user was born/current year
int GetLastTwoDigits(int fourDigitYear)
{
	if (fourDigitYear >= 1900 && fourDigitYear <= 1999)
	{ 
		return (fourDigitYear - 1900);
	}
	
	else
	{
		return (fourDigitYear - 2000);
	}
}// end of GetLastTwoDigits
 
	// finds the day of the week in which the user was born/current year
string GetDayOfWeek(int numOfMonth, int lastTwoDigits, int numOfDay, int fourDigitYear)
{
	string dayOfWeek = " ";
	int Total = 0, valueOfMonth = 0;
 
	if (numOfMonth == 1)
                valueOfMonth = 1;
	else if (numOfMonth == 2)
                valueOfMonth = 4;
	else if (numOfMonth == 3)
                valueOfMonth = 4;
	else if (numOfMonth == 4)
                valueOfMonth = 0;
	else if (numOfMonth == 5)
                valueOfMonth = 2;
	else if (numOfMonth == 6)
                valueOfMonth = 5;
	else if (numOfMonth == 7)
                valueOfMonth = 0;
	else if (numOfMonth == 8)
                valueOfMonth = 3;
	else if (numOfMonth == 9)
                valueOfMonth = 6;
	else if (numOfMonth == 10)
                valueOfMonth = 1;
	else if (numOfMonth == 11)
                valueOfMonth = 4;
	else if (numOfMonth == 12)
                valueOfMonth = 6;
	else
		cout <<"nError";
	
	Total = lastTwoDigits / 4;
	Total += lastTwoDigits;
	Total += numOfDay;
	Total += valueOfMonth;
	
	// uses the 'Total' variable from above to determine the day 
	// of the week in which you were born
	if ((fourDigitYear > 2000)&&((numOfMonth != 1)&&(numOfMonth != 2))&&(fourDigitYear != 2004))
	{ 
		Total = Total + 6;
	}
	else  if ((fourDigitYear < 2000) && ((numOfMonth == 1) || (numOfMonth == 2)))
	{ 
		Total = Total + 7;
	}
	else if ((fourDigitYear == 2000) && ((numOfMonth == 1) || (numOfMonth == 2)))
	{
		Total = Total -2;
	}
	else if ((fourDigitYear == 2004||fourDigitYear == 2000)&&((numOfMonth != 1)&&(numOfMonth != 2)))
	{
		Total = Total -1;
	}
	else if ((fourDigitYear % 4 == 0) && (fourDigitYear % 100 == lastTwoDigits) && (fourDigitYear % 400 == lastTwoDigits))
	{
		Total = Total-2;
	}
	else if ((fourDigitYear > 2000)&&((numOfMonth == 1)||(numOfMonth == 2))&&(fourDigitYear != 2004))
	{
		Total = Total + 6;
	}
 
	// uses the 'Total' variable from above to determine the day 
	// of the week in which you were born/when you birthday will be this year
	if (Total % 7 == 1)
                dayOfWeek = "Sunday";
	else if (Total % 7 == 2)
                dayOfWeek = "Monday";
	else if (Total % 7 == 3)
                dayOfWeek = "Tuesday";
	else  if (Total % 7 == 4)
                dayOfWeek = "Wednesday";
	else if (Total % 7 == 5)
                dayOfWeek = "Thursday";
	else if (Total % 7 == 6)
                dayOfWeek = "Friday";
	else if (Total % 7 == 0)
                dayOfWeek = "Saturday";
	else
		cout<< "nError";
 
	return dayOfWeek;
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Once compiled, you should get this as your output:
Note: The code was compiled five separate times to display the different outputs its able to produce

Please enter your name: MyProgrammingNotes Please enter the month in which you were born (between 1 and 12): 1 Please enter the day you were born (between 1 and 31): 1 Please enter the year you were born (between 1900 and 2099): 2012
Hello MyProgrammingNotes. Here are some facts about you! You were born January 1 2012 Your birth took place on a Sunday This year your birthday will take place on a Sunday You currently are, or will be 0 years old this year! --------------------------------------------------------------------- Please enter your name: Name Please enter the month in which you were born (between 1 and 12): 4 Please enter the day you were born (between 1 and 31): 2 Please enter the year you were born (between 1900 and 2099): 1957 Hello Name. Here are some facts about you! You were born April 2 1957 Your birth took place on a Tuesday This year your birthday will take place on a Monday You currently are, or will be 55 years old this year! --------------------------------------------------------------------- Please enter your name: Name Please enter the month in which you were born (between 1 and 12): 5 Please enter the day you were born (between 1 and 31): 7 Please enter the year you were born (between 1900 and 2099): 1999 Hello Name. Here are some facts about you! You were born May 7 1999 Your birth took place on a Friday This year your birthday will take place on a Monday You currently are, or will be 13 years old this year! --------------------------------------------------------------------- Please enter your name: Name Please enter the month in which you were born (between 1 and 12): 8 Please enter the day you were born (between 1 and 31): 4 Please enter the year you were born (between 1900 and 2099): 1983 Hello Name. Here are some facts about you! You were born August 4 1983 Your birth took place on a Thursday This year your birthday will take place on a Saturday You currently are, or will be 29 years old this year! --------------------------------------------------------------------- Please enter your name: Name Please enter the month in which you were born (between 1 and 12): 6 Please enter the day you were born (between 1 and 31): 7 Please enter the year you were born (between 1900 and 2099): 2987 You have entered an invalid year. Please enter a valid year. Press any key to continue . . .

Tag Archives: date

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