Leap Year Checker in Rust

This sample program that I wrote using Rust as my programming language will ask the user to give a year and then our program will determine whether the given year by our user is leap year or not a leap year.

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Sample Program Output

Program Listing

leap_year.rs

// Leap Year 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!("\tLeap Year Checker in Rust");

       println!("\n");

    let year: i32 = grab_input("Enter a Year ")

        .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 year % 400 == 0 {

    println!("\n"); 

    println!("The year {} is a leap year.",year);

    }

 else if year % 100 == 0 {

    println!("\n"); 

    println!("The year {} is a leap year.",year);

   }

 else if year % 4 == 0 {

    println!("\n"); 

    println!("The year {} is a leap year.",year);

   }

   else {

    println!("\n"); 

    println!("The year {} is not a leap year.",year);

   }

  

  

    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)

}