Rust猜数游戏

开始学习Rust，记录一下学Rust的经历
Rust版本的猜数游戏。

use rand::Rng; //trait
use std::cmp::Ordering;
use std::io; //prelude

fn main() {
    println!("猜数!");

    let secert_number = rand::thread_rng().gen_range(1..100);
    //println!("神秘数字是：{}", secert_number);

    loop {
        println!("猜测一个数。");
        let mut guess = String::new();
        io::stdin().read_line(&mut guess).expect("无法读取。");
        println!("你猜测的数是：{}", guess);

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

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