Check even or odd in Cairo

[danielcdz]

Description

• We want to have a dedicated script in Cairo that checks if a number is even or odd in Cairo.

Steps

• Add a new script in the dedicated scripts directory

[petersdt]

@danielcdz kindly assign me this issue when ODhack10 starts

i experience in writing smart contracts and writing test for smart contracts a pseduo approach to the above would be as following:

1. I'll create a function called 'check_even_odd' that takes a u256 number as input
2. I'll use Cairo's modulo operator (%) to divide by 2 and check remainder: number % 2 will give me either 0 or 1
3. for return value, I'll return a boolean:
   • true for even
   • false for odd
     4. I'll create test cases to verify:
   • I'll test with 0 (should be even)
   • I'll test with 1 (should be odd)
   • I'll test with some larger numbers
4. error handling:

I'll need to consider:

• How I want to handle negative numbers
• Any potential overflow cases for very large numbers

[Emrys02]

Hi @danielcdz my approach would be to use the modulo operator to determine if the input is even or odd then return an appropriate boolean

[Michaelkingsdev]

After learning cairo, i would love to get my hands on this task. The difficulty level is easy so i can handle it. My ETA is 48hrs. Thanks

[SoarinSkySagar]

May I work on this issue @danielcdz?

[omsant02]

i would like to take this issue @danielcdz

i am a new contributor to repo and would like to start my contribution journey with stark-cairo-nodes

would solve this by if and else condition for number%2==0

Thank you

[codeZe-us]

Will write a script that checks if a number is even or odd. ETA: 2 hours.

[Emmanex01]

Can I start working on this?

[BrunoAmbricca]

I would like to work on this issue

[Thibrac]

Hi, I'm level 6 on NG, I would do this issue if possible :)

[mimisavage]

Let me try this one!

[aurlic]

Hey ! I would love to work on this issue to put my newly acquired skill to the test. I am currently learning with NodeGuardians and think I could handle this. Thanks in advance !

[GideonBature]

I’d like to work on this.

My name is Gideon Bature, a Software Engineer with experience building Starknet based smart contracts, using Cairo. If given this issue, I should be able to send my first PR within 48 hrs.

Thank you!

[Unickhub]

Can I start working on this?

[Benjtalkshow]

I’d like to work on this.

[ChrisFernandezVivas]

hi ,im from dojo coding

my steps

1- try use a "%" module operand

if the module between 2 values is 0 , is even ..

[akintewe]

Hello can i be assigned this issue, i am a new contributor with experience in Cario, would love to work on this , my ETA is >5 Hours and ill create a draft PR in 4 hours time. Thank you for this opportunity. :)

[MullerTheScientist]

can i help with this task

[ryzen-xp]

Hi, I am proficient Blockchain developer expert in Cairo , Rust and Solidity and also in web development. I have contributed many cairo ,rust projects like chainevents , arkprojects etc . please /assign this issue . Thank You

[mimiprosper]

Can I start working on this? Am a web 2 frontend developer, a solidity smart contract developer/auditor and a cairo smart contract developer. Am a graduate of Starknet Cairo Bootcamp. I have successfully done tasks assigned to me in OnlyDust. If assigned this i would complete it within 1 day.