安装

安装

#查看版本
$ rustc --version
$ cargo --version

$ rustup --version
$ cargo -h


#更新版本
$ rustup update

#卸载版本
$ rustup self uninstall

创建项目

$ cargo new project_name

构建项目

$ cargo build

构建并运行项目

$ cargo run

检查代码确保能通过编译，但不会产生可执行文件。

$ cargo check

构建生产包

$ cargo build --release

引入外部依赖库

$ cargo add rand

更新外部依赖库 latest 版本

$ cargo update

猜数游戏

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

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

    let secret_number = rand::thread_rng().gen_range(1..=100);
    println!("The secret number is {}", secret_number);

    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;
            }
        }
    }
}