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<span class="title"><a href="index.html">Rust 튜토리얼</a></span>
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<h1>The Rust Playground</h1>
<p>이 웹사이트에서는 <a href="https://play.rust-lang.org" target="_blank" rel="noopener">Rust Playground</a> 를 사용하여 온라인에서 직접 실행해 볼 수 있습니다.</p>
<p>우측에서 보다시피 <code>println()</code>도 아닌 <code>println!()</code> 와 같은 코드를 사용하여 stdout에 출력하는 것을 볼 수 있습니다.</p>
<p><code>!</code> 이것은 매크로 (Macro)라는 Rust 언어의 특별한 기능 중 하나인데 우선은 생김새만 알고 나중에 뭔지 알아보겠습니다.</p>
<p>Rust 언어는 쉽게 작성할 수 있도록 (syntactic sugar) 도와주지만 사실은 컴파일러가 아래처럼 처리합니다.</p>
<p>(<code>cargo inspect</code> 명령어)</p>
<pre><code class="rust">#![feature(prelude_import)]
#[prelude_import]
use std::prelude::rust_2018::*;
#[macro_use]
extern crate std;
fn main() {
{
::std::io::_print(format_args!("Welcome to the playground! You can modify the code in here.\n"));
};
}</code></pre>
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