Even Odd in Rust

Published on 31 October 2019 (Updated: 08 May 2023)

Welcome to the Even Odd in Rust page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

// Requirement is in https://sample-programs.therenegadecoder.com/projects/even-odd/
// Program to accept an integer on the command line and outputs if the integer is Even or Odd.

use std::env::args;
use std::process::exit;
use std::str::FromStr;

fn usage() -> ! {
    println!("Usage: please input a number");

fn parse_int<T: FromStr>(s: &str) -> Result<T, <T as FromStr>::Err> {

fn main() {
    let mut args = args().skip(1);

    // Exit if 1st command-line argument not an integer
    let mut input_num: i32 = args
        .and_then(|s| parse_int(&s).ok())
        .unwrap_or_else(|| usage());

    // Even if divisible by 2, Odd otherwise
    match input_num % 2 == 0 {
        true => println!("Even"),
        false => println!("Odd"),

Even Odd in Rust was written by:

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

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How to Run the Solution

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