rust

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// #[derive(Debug)]  // 调试模式 
/* 依赖 rand = "0.6.0 "*/
use rand::Rng; //trait
use std::io; //trait //prelude  // 获取命令行输入
use std::cmp::Ordering;
fn main() {
    println!("猜数游戏");
    let mut rngs = rand::thread_rng().gen_range(1,100);
    println!("神秘数字: {}",rngs);
    loop {
        println!("猜一个数");
        let mut gress =  String::new();
        io::stdin().read_line(&mut gress).expect("无法读取");
        let gress:u32 = match gress.trim().parse(){
            Ok(num)=>num,
            Err(err) => continue,
        };
        println!("你猜的数: {}",gress);
        match gress.cmp(&rngs) {
            Ordering::Less => println!("小了"),
            Ordering::Greater => println!("大了"),
            Ordering::Equal=>{
                println!("猜中了");
                break
            }
        }
    }
}