RustTheBook学习笔记01——HelloWorld&猜数字游戏Demo

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HelloWorld

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fn main() {
    println!("hello world!");
}

猜数字游戏Demo

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

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

    // 随机生成一个秘密数字
    let secret_num = rand::thread_rng().gen_range(1, 101);

    //println!("秘密数字是：{}", secret_num);

    loop {
        println!("请猜测一个数：");

        // 声明一个字符串保存键盘输入
        let mut guess_number = String::new();

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

        let guess_number: i32 = match guess_number.trim().parse() {
            Ok(num) => num,
            Err(_) => {
                println!("您输入的不是数字，请重新输入！");
                continue;
            }
        };

        match guess_number.cmp(&secret_num) {
            Ordering::Less => println!("小了\n"),
            Ordering::Greater => println!("大了\n"),
            Ordering::Equal => {
                println!("Win!\n");
                break;
            }
        }
    }
}