webscale.rs

use std::io;
use std::rand;
use std::cmp::Ordering;

fn main() {
    println!("Guess the number!");

    let secret_number: u32 = (rand::random::<u32>() % 100) + 1;

    loop {
        println!("Please enter your guess");
        let input = io::stdin().read_line()
                               .ok()
                               .expect("Failed to read line");
        let num = match input.trim().parse::<u32>() {
            Some(n)   => n,
            None        => {
                println!("Please enter a number");
                continue
            },
        };

        println!("You guessed {}", num);

        match cmp(num, secret_number) {
            Ordering::Greater   => println!("Too big!"),
            Ordering::Less      => println!("Too small!"),
            Ordering::Equal     => {
                println!("You win!");
                return;
            }
        }
    }
}

fn cmp(a: u32, b: u32) -> Ordering {
    if a < b { Ordering::Less }
    else if a > b { Ordering::Greater }
    else { Ordering::Equal }
}