Odd and Even Number Checker in Rust

Hello friends in this article I would like to share with you how to write a program to check if the given number by the user is odd or even number  using Rust Programming language. Yesterday I am attending a lecture in Mozilla Philippines office here in Makati City, Philippines. The talk is given by Sir Bob Reyes a Mozilla representative here in the Philippines he is discussing the Rust programming language I found his lecture interesting because Rust is designed for systems programming and best of all it is open source.

Rust is a programming language that is developed by Mozilla foundation the creator of Mozilla Firefox web browser one of the most popular and secure web browser in the world. I hope you will give a try to learn Rust.

In this program it will ask the user to give a number and then our program will determine whether the given number is odd and even.

Add me at Facebook my address  is jakerpomperada@gmail.com and jakerpomperada@yahoo.com.

My mobile number here in the Philippines is 09173084360.

Sample Program Output

Program Listing

odd_even.rs

// Odd and Even Number Checker in Rust Programming language.

// Written By: Mr. Jake R. Pomperada, MAED-IT

// July 17, 2016

use std::io::{self, Write};

use std::fmt::Display;

use std::process;

fn main() {

       println!("\n");

       println!("\tOdd and Even Number Checker in Rust");

       println!("\n");

    let value: i32 = grab_input("Enter a Number ")

        .unwrap_or_else(|e| exit_err(&e, e.raw_os_error().unwrap_or(-1)))

        .trim()

        .parse()

        .unwrap_or_else(|e| exit_err(&e, 2));

   if value % 2 == 0 {

    println!("\n"); 

    println!("The number {} is an EVEN number.",value);

} else {

    println!("\n");

    println!("The number {} is an ODD number.",value);

   }

    println!("\n"); 

    println!("End of Program");

}

fn grab_input(msg: &str) -> io::Result<String> {

    let mut buf = String::new();

    print!("{}: ", msg);

    try!(io::stdout().flush());

    try!(io::stdin().read_line(&mut buf));

    Ok(buf)

}

fn exit_err<T: Display>(msg: T, code: i32) -> ! {

    let _ = writeln!(&mut io::stderr(), "Error: {}", msg);

    process::exit(code)

}