Rust chapter1（猜数游戏）

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

fn main() {
    println!("猜数！!！");

    let secret_number = rand::thread_rng().gen_range(1, 101);
    println!("神秘数字是：{}", secret_number);

    loop{
        println!("请输入一个数:");
        //let mut foo = 1;
        //let bar = foo;
        let mut guess = String::new();
        io::stdin().read_line(&mut guess).expect("无法正常读取行");

        let guess: u32 = match guess.trim().parse() {
            Ok(num) => num, 
            Err(_) => continue,
        };

        println!("你猜的数是 {}", guess);
        //
        match guess.cmp(&secret_number) {
            Ordering::Less => println!("To small!"),
            Ordering::Greater => println!("To big!"),
            Ordering::Equal => {
                println!("You Win");
                break;
            },
        }
    }
    

}