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<h2 id="hello-world"><a class="header" href="#hello-world">Hello, World!</a></h2>
<!-- https://github.com/rust-lang/book/blob/main/src/ch01-02-hello-world.md -->
<!-- commit aba1ee29dca6c90a1737c996efd7c870957aefb8 -->
<p>既然安装好了 Rust，是时候来编写第一个 Rust 程序了。当学习一门新语言的时候，使用该语言在屏幕上打印 <code>Hello, world!</code> 是一项传统，我们将沿用这一传统！</p>
<blockquote>
<p>注意：本书假设你熟悉基本的命令行操作。Rust 对于你的编辑器、工具，以及代码位于何处并没有特定的要求，如果你更倾向于使用集成开发环境（IDE），而不是命令行，请尽管使用你喜欢的 IDE。目前很多 IDE 都在一定程度上支持 Rust；查看 IDE 文档以了解更多细节。Rust 团队一直致力于借助 <code>rust-analyzer</code> 提供强大的 IDE 支持。详见<a href="appendix-04-useful-development-tools.html">附录 D</a><!-- ignore -->。</p>
</blockquote>
<h3 id="创建项目目录"><a class="header" href="#创建项目目录">创建项目目录</a></h3>
<p>首先创建一个存放 Rust 代码的目录。Rust 并不关心代码的存放位置，不过对于本书的练习和项目来说，我们建议你在 home 目录中创建 <em>projects</em> 目录，并将你的所有项目存放在这里。</p>
<p>打开终端并输入如下命令创建 <em>projects</em> 目录，并在 <em>projects</em> 目录中为 “Hello, world!” 项目创建一个目录。</p>
<p>对于 Linux、macOS 和 Windows PowerShell，输入：</p>
<pre><code class="language-console">$ mkdir ~/projects
$ cd ~/projects
$ mkdir hello_world
$ cd hello_world
</code></pre>
<p>对于 Windows CMD，输入：</p>
<pre><code class="language-cmd">&gt; mkdir "%USERPROFILE%\projects"
&gt; cd /d "%USERPROFILE%\projects"
&gt; mkdir hello_world
&gt; cd hello_world
</code></pre>
<h3 id="编写并运行-rust-程序"><a class="header" href="#编写并运行-rust-程序">编写并运行 Rust 程序</a></h3>
<p>接下来，新建一个源文件，命名为 <em>main.rs</em>。Rust 源文件总是以 <em>.rs</em> 扩展名结尾。如果文件名包含多个单词，那么按照命名习惯，应当使用下划线来分隔单词。例如命名为 <em>hello_world.rs</em>，而不是 <em>helloworld.rs</em>。</p>
<p>现在打开刚创建的 <em>main.rs</em> 文件，输入示例 1-1 中的代码。</p>
<figure class="listing">
<p><span class="file-name">文件名：main.rs</span></p>
<pre class="playground"><code class="language-rust edition2024">fn main() {
println!("Hello, world!");
}</code></pre>
<figcaption>示例 1-1：一个打印 `Hello, world!` 的程序</figcaption>
</figure>
<p>保存文件，并回到当前目录为 <em>~/projects/hello_world</em> 的终端窗口。在 Linux 或 macOS 上，输入如下命令，编译并运行文件：</p>
<pre><code class="language-console">$ rustc main.rs
$ ./main
Hello, world!
</code></pre>
<p>在 Windows 上，输入命令 <code>.\main.exe</code>，而不是 <code>./main</code>：</p>
<pre><code class="language-powershell">&gt; rustc main.rs
&gt; .\main
Hello, world!
</code></pre>
<p>不管使用何种操作系统，终端应该打印字符串 <code>Hello, world!</code>。如果没有看到这些输出，回到安装部分的 <a href="ch01-01-installation.html#故障排除troubleshooting">“故障排除”</a> 小节查找有帮助的方法。</p>
<p>如果 <code>Hello, world!</code> 出现了，恭喜你！你已经正式编写了一个 Rust 程序。现在你成为一名 Rust 程序员，欢迎！</p>
<h3 id="rust-程序的结构"><a class="header" href="#rust-程序的结构">Rust 程序的结构</a></h3>
<p>现在，让我们回过头来仔细看看这个 “Hello, world!” 程序。这是第一块拼图：</p>
<pre class="playground"><code class="language-rust edition2024">fn main() {
}</code></pre>
<p>这几行定义了一个名叫 <code>main</code> 的函数。<code>main</code> 函数是一个特殊的函数：在可执行的 Rust 程序中，它总是最先运行的代码。第一行代码声明了一个叫做 <code>main</code> 的函数，它没有参数也没有返回值。如果有参数的话，它们的名称应该出现在小括号 <code>()</code> 中。</p>
<p>函数体被包裹在 <code>{}</code> 中。Rust 要求所有函数体都要用花括号包裹起来。一般来说，将左花括号与函数声明置于同一行并以空格分隔，是良好的代码风格。</p>
<blockquote>
<p>注：如果你希望在 Rust 项目中保持一种标准风格，可以使用名为 <code>rustfmt</code> 的自动格式化工具将代码格式化为特定的风格（更多内容详见<a href="appendix-04-useful-development-tools.html">附录 D</a> 中的 <code>rustfmt</code><!-- ignore -->）。Rust 团队已经在标准的 Rust 发行版中包含了这个工具，就像 <code>rustc</code> 一样。所以它应该已经安装在你的电脑中了！</p>
</blockquote>
<p>在 <code>main</code> 函数体中有如下代码：</p>
<pre class="playground"><code class="language-rust edition2024"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>println!("Hello, world!");
<span class="boring">}</span></code></pre>
<p>这行代码完成这个简单程序的所有工作：在屏幕上打印文本。这里有三个重要的细节需要注意。</p>
<p>首先，<code>println!</code> 调用了一个 Rust 宏（macro）。如果是调用函数，则应输入 <code>println</code>（没有<code>!</code>）。我们将在<a href="ch20-05-macros.html">第二十章</a>详细讨论宏。现在你只需记住，当看到符号 <code>!</code> 的时候，就意味着调用的是宏而不是普通函数，并且宏并不总是遵循与函数相同的规则。</p>
<p>第二，<code>"Hello, world!"</code> 是一个字符串。我们把这个字符串作为一个参数传递给 <code>println!</code>，字符串将被打印到屏幕上。</p>
<p>第三，该行以分号结尾（<code>;</code>），这代表一个表达式的结束和下一个表达式可以开始。大部分 Rust 代码行以分号结尾。</p>
<h3 id="编译和运行是彼此独立的步骤"><a class="header" href="#编译和运行是彼此独立的步骤">编译和运行是彼此独立的步骤</a></h3>
<p>你刚刚运行了一个新创建的程序，那么让我们检查此过程中的每一个步骤。</p>
<p>在运行 Rust 程序之前，必须先使用 Rust 编译器编译它，即输入 <code>rustc</code> 命令并传入源文件名称，如下：</p>
<pre><code class="language-console">$ rustc main.rs
</code></pre>
<p>如果你有 C 或 C++ 背景，就会发现这与 <code>gcc</code> 和 <code>clang</code> 类似。编译成功后，Rust 会输出一个二进制的可执行文件。</p>
<p>在 Linux、macOS 或 Windows 的 PowerShell 上，在 shell 中输入 <code>ls</code> 命令可以看见这个可执行文件。</p>
<pre><code class="language-console">$ ls
main main.rs
</code></pre>
<p>在 Linux 和 macOS，你会看到两个文件。在 Windows PowerShell 中，你会看到同使用 CMD 相同的三个文件。在 Windows 的 CMD 上，则输入如下命令：</p>
<pre><code class="language-cmd">&gt; dir /B %= the /B option says to only show the file names =%
main.exe
main.pdb
main.rs
</code></pre>
<p>这展示了扩展名为 <em>.rs</em> 的源文件、可执行文件（在 Windows 下是 <em>main.exe</em>，其它平台是 <em>main</em>），以及当使用 CMD 时会有一个包含调试信息、扩展名为 <em>.pdb</em> 的文件。从这里开始运行 <em>main</em> 或 <em>main.exe</em> 文件，如下：</p>
<pre><code class="language-console">$ ./main # Windows 是 .\main.exe
</code></pre>
<p>如果这里的 <em>main.rs</em> 是上文所述的 “Hello, world!” 程序，那么在终端上就会打印出 <code>Hello, world!</code>。</p>
<p>如果你更熟悉动态语言，如 Ruby、Python 或 JavaScript，则可能不习惯将编译和运行分为两个单独的步骤。Rust 是一种 <strong>预编译静态类型</strong>（<em>ahead-of-time compiled</em>）语言，这意味着你可以编译程序，并将可执行文件送给其他人，他们甚至不需要安装 Rust 就可以运行。如果你给他人一个 <em>.rb</em>、<em>.py</em> 或 <em>.js</em> 文件，他们需要先分别安装 Ruby，Python，JavaScript 实现（运行时环境，VM）。不过在这些语言中，只需要一句命令就可以编译和运行程序。这一切都是语言设计上的权衡取舍。</p>
<p>仅仅使用 <code>rustc</code> 编译简单程序是没问题的，不过随着项目的增长，你可能需要管理你项目的方方面面，并让代码易于分享。接下来，我们要介绍一个叫做 Cargo 的工具，它会帮助你编写真实世界中的 Rust 程序。</p>
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