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hello world! bluesky
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part 1
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bluesky
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rust
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part 3
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hello world
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seahorse
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part 4
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<ul class="articles">
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ai
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config
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mention
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base64
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<li class="chapter " data-level="1.7" data-path="../c5/">
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part 5
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end
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >hello world</a>
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</h1>
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</div>
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<section class="normal markdown-section">
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<h3 id="init">init</h3>
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<p>まず、rustでプログラムの雛形を作ります。</p>
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<pre><code class="lang-sh">mkdir -p ~/rust
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<span class="hljs-built_in">cd</span> ~/rust
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cargo init
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</code></pre>
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<pre><code class="lang-sh">.
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├── Cargo.toml
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└── src
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└── main.rs
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</code></pre>
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<p>これらのファイルは自分で作成してもいいし、<code>init</code>で作成してもいいです。</p>
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<div><p class="code-filename">Cargo.toml</p></div>
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<pre><code class="lang-toml"><span class="hljs-section">[package]</span>
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<span class="hljs-attr">name</span> = <span class="hljs-string">"rust"</span>
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<span class="hljs-attr">version</span> = <span class="hljs-string">"0.1.0"</span>
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<span class="hljs-attr">edition</span> = <span class="hljs-string">"2021"</span>
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<span class="hljs-comment"># See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html</span>
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<span class="hljs-section">
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[dependencies]</span>
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</code></pre>
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<div><p class="code-filename">src/main.rs</p></div>
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<pre><code class="lang-rust"><span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">main</span></span>() {
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<span class="hljs-built_in">println!</span>(<span class="hljs-string">"Hello, world!"</span>);
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}
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</code></pre>
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<p>ちなみに、コンピュータ上ではディレクトリもファイルなのです。この話は面倒なので省略します。</p>
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<h4 id="editor">editor</h4>
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<p>次にプログラムの中身を確認してみます。</p>
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<p>確認するには、editor(エディタ)を使用します。私は<code>vim</code>を使いますが、<a href="https://visualstudio.microsoft.com" target="_blank">visual studio</a>がオススメかな。</p>
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<pre><code class="lang-sh">brew install vim
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vim src/main.rs
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</code></pre>
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<div><p class="code-filename">src/main.rs</p></div>
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<pre><code class="lang-rust"><span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">main</span></span>() {
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<span class="hljs-built_in">println!</span>(<span class="hljs-string">"Hello, world!"</span>);
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}
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</code></pre>
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<p>これは<code>hello world!</code>という文字列を出力するプログラムです。</p>
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<h4 id="build">build</h4>
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<p>このsrcを<code>build</code>して<code>binary</code>、つまり、アプリ本体に変換することで、そのパソコンで実行できるようになります。</p>
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<pre><code class="lang-sh">cargo build
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</code></pre>
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<div><p class="code-filename">target/debug/rust</p></div>
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<pre><code class="lang-sh">target
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└── debug
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├── rust ← このファイルがbinary
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└── rust.d
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</code></pre>
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<p>rustはワンバイナリと言って、コンパイル結果が単一ファイルなので、非常に良い言語です。</p>
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<pre><code class="lang-sh">$ ./target/debug/rust
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Hello, world!
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</code></pre>
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</section>
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