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

fn main() {
    let secret_number = rand::thread_rng().gen_range(1..101);

    loop {
        println!("Guessing a number:");

        let mut guess_number = String::new();

        io::stdin().read_line(&mut guess_number)
            .expect("Failed to read line.");

        let guess_number: u32 = match guess_number.trim().parse() {
            Ok(num) => num,
            Err(_) => {
                println!("Not a number.");
                continue;
            }
        };

        println!("You guess : {:?}", guess_number);

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