Check Leap Year

Video Summary: https://youtu.be/xBzcCq04Iuk

In this exercise, you will check if a year is a leap year. Each check will be divided into a sub-function.

A year is a leap year if it is divisible by 400, or divisible by 4 but not divisible by 100.

Create a function called checkLeapYear that takes an int year and returns bool
Create three functions to check if a number is divisible by 400, 4, and 100. Each should also return a bool
Call these functions from checkLeapYear
If the conditions are met and it is a leap year, have checkLeapYear return true, otherwise return false
Print the result

Solution

/*
Program name: leapyear.cpp
Author: Devon Blewett
Purpose: This program takes a year input from the user and calculates if it is a leap year

Written for the Open Textbooks program
*/

#include <iostream>

using namespace std;
// function prototypes go here
bool checkLeapYear(int year);
bool divisibleBy4(int year);
bool divisibleBy400(int year);
bool divisibleBy100(int year);

int main()
{
    // variable to hold the year
    int year;
    // boolean variable to determine if it is or isn't a leap year
    bool isLeapYear;
    
    cout << "Enter a year: " << endl;
    cin >> year;
    // call to value returning function.  Return is "captured" in isLeapYear.  The year that was input is passed as a parameter
    isLeapYear = checkLeapYear(year);
    // if isLeapYear is true, print is a leap year
    if(isLeapYear){
        cout << year << " is a leap year" << endl;
    }
    // else print it is not a leap year
    else {
        cout << year << " is not a leap year" << endl;
    }
}
/*
function name: checkLeapYear
parameters: int year - the year to evaluate
purpose: Check if a year is a leap year or not
returns: true if a leap year, false if not a leap year
side effects: N/A
*/
bool checkLeapYear(int year){

if(divisibleBy400(year)){
        return true;
    }

if(divisibleBy4(year) && !divisibleBy100(year)){
        return true;
    }

return false;
}
/*
function name: divisibleBy4
parameters: int year - the year to evaluate
purpose: Check if a year is divisible by 4
returns: true if divisible, false if not
side effects: N/A
*/
bool divisibleBy4(int year){
    if(year % 4 == 0)
        return true;
    return false;
}
/*
function name: divisibleBy400
parameters: int year - the year to evaluate
purpose: Check if a year is divisible by 400
returns: true if divisible, false if not
side effects: N/A
*/
bool divisibleBy400(int year){
    if(year % 400 == 0)
        return true;
    return false;
}
/*
function name: divisibleBy100
parameters: int year - the year to evaluate
purpose: Check if a year is divisible by 100
returns: true if divisible, false if not
side effects: N/A
*/
bool divisibleBy100(int year){
    if(year % 100 == 0)
        return true;
    return false;
}

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