7Cargo包crate

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7 Cargo/包/crate

7.1 包和 Crate

一些cargo命令

命令	描述
cargo check	只检查代码
cargo new	创建项目
cargo run	编译并运行
cargo build	编译
cargo build --release	优化编译打包

cargo.toml

edition:rust版本

猜数游戏

use std::{cmp::Ordering, io};

use rand::Rng;

/**
 * 猜数游戏
 */
fn main() {
  println!("猜数游戏！");
  let secret_number = rand::thread_rng().gen_range(1..101);

  println!("神秘数字：{}", secret_number);

  loop {
    println!("猜一个数字：");
    let mut guess = String::new();

    io::stdin().read_line(&mut guess).expect("无法读取");

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

    println!("你猜的数字为：{}", guess);
    match guess.cmp(&secret_number) {
      Ordering::Less => println!("Too small!"),
      Ordering::Greater => println!("Too large!"),
      Ordering::Equal => {
        println!("You win!");
        break;
      }
    }
  }
}