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1.首先cargo一个项目

 cargo new guessing_game

2.修改toxml
添加依赖

[dependencies]
rand = "0.3.14"

3.切换数据源,一来源
对于在国内的人来说，Rust开发时有时使用官方的源太慢，可以考虑更换使用国内中科大的源。更换方法如下： 在 $HOME/.cargo/config 中添加如下内容（如果文件不存在请直接新建该文件）：

[source.crates-io]
registry = "https://mirrors.ustc.edu.cn/crates.io-index"
replace-with = 'ustc'

[source.ustc]
registry = "https://mirrors.ustc.edu.cn/crates.io-index"

4.引入依赖的api文档

cargo doc --open

5.最终代码

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

fn main() {
    println!("Guess the number!");

    let secret_number = rand::thread_rng().gen_range(1, 101);

    loop {
        println!("Please input your guess.");

        let mut guess = String::new();

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

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

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

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

效果图

代码已上传