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'

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Posted in: Basic, C++ Tags: c++, date, functions

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

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