rust.rs

use std::io;
use std::io::Write;
use rand::Rng;
use std::cmp::Ordering;
use std::num::ParseIntError;

fn parse_str(s: &str) -> Result<u32, ParseIntError> {
    s.trim().parse::<u32>()?
}

fn main() {
    println!("Hello, world!");

    let secret: u32 = rand::thread_rng().gen_range(1, 101);

    loop {
        print!("Enter a guess: ");
        io::stdout().flush().expect("Error flushing stdout.");

        let mut guess = String::new();
        io::stdin().read_line(&mut guess).expect("Error reading line.");
        let guess = parse_str(&guess).ok();
        let a = 2.0/3.0;
        println!("{}", a);

        let result = match (guess.cmp(&secret)) {
            Ordering::Less => "Too small!",
            Ordering::Equal => {
                println!("You win!");
                break;
            },
            Ordering::Greater => "Too big!"
        };

        println!("{}", result);
        println!("You guessed {}.", guess);
    }
}