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

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.

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 . . .

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Posted in: Basic, C++ Tags: c++, date, functions, if/else, name, string, switch

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

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