roiqk7 / iseven

The ultimate isEven() implementation is here! And it supports all integers, from 0 all the way to 100 million!

The Ultimate isEven()!

Have you ever wondered if a number is even or odd? Well, those times are over! With this implementation of isEven() you can once and for all determine if a number is even! And it doesn't end here! I also included isOdd() so you can be 100% sure when a number is odd!

Contents

• Installation
• How to use?
• Description
• Going over a BILLION...

Installation

1. Clone this repository (if you haven't done so already).

git https://github.com/Roiqk7/isEven

2. Default isEven.cpp supports integers from -600420 to 600420 (because GitHub doesn't allow for larger files). If that's fine with you, you can stop there. Otherwise, if you want more integers, follow the rest of this tutorial.
3. Open your terminal.
4. Go into the repo directory.
5. Run python3 build.py. That will make isEven.cpp support integers all the way up to 100 million. This action takes around 1 minute on MacBook M2. To learn how to change this ceiling, click here!
6. Everything is set and done!

How to use?

For example, usage refers to example.cpp.

How to use example.cpp

1. Follow the steps in Installation (if you haven't done so already).
2. Open your terminal.
3. Go into the repo directory.
4. Run g++ -std=c++17 -o example example.cpp isEven.cpp isOdd.cpp evenVector.cpp && ./example
5. Find out if your favorite number is even or odd!

Changing max supported value

How do I change the ceiling of isEven.cpp? Easily!

1. Open build.py in your text editor of choice.
2. At line 8, notice the variable totalIterations.
3. Change it's value to whatever you deem necessary!

Description

This repository is mainly used to determine if a number is even or odd using isEven() function defined in isEven.cpp and isOdd() function defined in isOdd.cpp. These functions then store a LOT of numbers to check whether the desired number is even or odd. Keep in mind that the functions only support numbers defined within them.

Also we have EvenVector class which adds a simple to use data structure to determine if a number is even or odd. Simply use the overloaded [] operator with a number you want to know is even or not and a proper boolean value will be returned to you as output.

Going over a BILLION...

Well... it's not really recommended. Look at the image bellow to see exactly how totalIterations = 1 Billion is large. Also, it takes around 10 minutes to build. I tried rewriting build.py in C++, but it didn't improve the performance at all.