Even Odd in Rust

Published on 31 October 2019 (Updated: 31 October 2019)

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.

Note: The solution shown above is the current solution in the Sample Programs repository as of May 08 2023 19:53:07. The solution was first committed on Oct 31 2019 16:49:58. As a result, documentation below may be outdated.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.