Even Odd in Rust

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");
    exit(0);
}

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

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

    // Exit if 1st command-line argument not an integer
    let mut input_num: i32 = args
        .next()
        .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:

• Mallikarjuna S J
• rzuckerm

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

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.