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| author | garhve <git@garhve.com> | 2023-01-18 08:57:33 +0800 |
|---|---|---|
| committer | garhve <git@garhve.com> | 2023-01-18 08:57:33 +0800 |
| commit | d587af5b14bc980aa62957f4893698dc54c57edc (patch) | |
| tree | ccedced7e188c4ccbee91bb314fe23710806894d /public/post/rust-basic/index.html | |
| parent | f32a1f25a36c6611fd34525cb321dd9a50cab5aa (diff) | |
delete blog
Diffstat (limited to 'public/post/rust-basic/index.html')
| -rw-r--r-- | public/post/rust-basic/index.html | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/public/post/rust-basic/index.html b/public/post/rust-basic/index.html deleted file mode 100644 index e7d9d0a..0000000 --- a/public/post/rust-basic/index.html +++ /dev/null @@ -1,107 +0,0 @@ -<!DOCTYPE html> -<html lang="en"> - -<head> - <meta charset="utf-8"> - -<title>rust basic -- types and ownership | garhve's gibberish</title> - - - <link rel="shortcut icon" type="image/png" href="/images/favicon.png"> - <meta name="viewport" content="width=device-width,initial-scale=1"> - - <link id="stylesheet" rel="stylesheet" type="text/css" href="/dark.css"> - - <script type="text/javascript" src="/js/theme.js"></script> - -</head> - -<div class="header"> - <div class="site_title"> - <p><a href="/"><img src="https://blog.garhve.com/images/logo.png" alt="garhve's gibberish" - width="70" height=auto></a></p> - <p><a href="/"> garhve's gibberish</a></p> - </div> - <div class="menu"> - <!-- <a href="/tags">tags</a> - --><a href="/categories">categories</a> - </div> -</div> - -<body onload="getTheme()"> - <section class="section"> - <div class="container"> - -<p> - <div class="title_postpage">rust basic -- types and ownership</div> -</p> -<p> - <div class="date_postpage">2023-01-12</div> - <div class="taxonomies_postpage"> - - - <a href="https://blog.garhve.com/categories/code/">/code</a> - - - - -  <a href="https://blog.garhve.com/tags/rust/">#rust</a> - - - </div> -</p> - -<p> - <h2 id="types">Types</h2> -<blockquote> -<p>This is a summary of rust basic knowledge I learned from (Rust the Book)[https://doc.rust-lang.org/book/] chapter 1 ~ chapter 13 -I will use C to compare with since I familiar it.</p> -</blockquote> -<p>There are a bunch of built-in types we can work with: <em>scalar types</em> and <em>compound types</em>. -Those scalar types are just alike as C language.</p> -<table><thead><tr><th>scalar types</th><th>rust</th><th>c</th></tr></thead><tbody> -<tr><td>integer</td><td>i(u)8/i16/i32(default)/i64</td><td>(unsigned) char/short/int/long</td></tr> -<tr><td>float</td><td>f32/f64(default)</td><td>float/double</td></tr> -<tr><td>boolean</td><td>true/false</td><td>True/False (non-zero/zero)</td></tr> -<tr><td>character</td><td>char</td><td>char</td></tr> -</tbody></table> -<p>The compound types are a bit different. rust provides many hands-on types where C type is not the same or needs to define explicitly.</p> -<table><thead><tr><th>compound type</th><th>rust</th><th>c</th></tr></thead><tbody> -<tr><td>struct</td><td>same</td><td>same</td></tr> -<tr><td>enum</td><td>enum element can be seen as key that could take value</td><td>represent numberic value, default starting from 0</td></tr> -<tr><td>array</td><td>vector</td><td>array</td></tr> -<tr><td>string</td><td>a wraper of vector</td><td>pointer of char *</td></tr> -<tr><td>tuple</td><td>exist</td><td>no such type in C</td></tr> -</tbody></table> -<p>Variable declaration in rust is kinda tricky.</p> -<p>A normal declare syntax would be like <code>let unmutable_variable = 3</code>. This will imply that variable is <code>i32</code> type -since the value we assign to is a integer and the default type for integer on most OS is <code>i32</code>. -We can explicit type by using type annotation: <code>let unmutable_variable: u8 = 3</code>. This will make variable -<code>unmutable_variable</code> is <code>u8</code> type and has 3 as its value. We need to assign a value -to variable if we don't annotate type while declaration, otherwise compiler would prompt error.</p> -<p>Notice that, declaration as above one won't allow us to change value, if we want to be able to change variable's -value at runtime, we need to explicit it, for security reason: </p> -<pre data-lang="rust" style="background-color:#2e3440;color:#d8dee9;" class="language-rust "><code class="language-rust" data-lang="rust"><span style="color:#81a1c1;">let mut</span><span> mutable_variable </span><span style="color:#81a1c1;">= </span><span style="color:#b48ead;">3</span><span style="color:#eceff4;">; -</span><span>println!(</span><span style="color:#a3be8c;">"first define: </span><span style="color:#ebcb8b;">{mutable_variable}</span><span style="color:#a3be8c;">"</span><span>)</span><span style="color:#eceff4;">; -</span><span>mutable_variable </span><span style="color:#81a1c1;">= </span><span style="color:#b48ead;">5</span><span style="color:#eceff4;">; -</span><span> -</span><span>println!(</span><span style="color:#a3be8c;">"change value to: </span><span style="color:#ebcb8b;">{mutable_variable}</span><span style="color:#a3be8c;">"</span><span>)</span><span style="color:#eceff4;">; -</span></code></pre> -<blockquote> -<p><code>println!()</code> is called macro, which would not cover for now.</p> -</blockquote> - -</p> - - - - - </div> - </section> -</body> - -<div class="footer"> -  © garhve -</div> - -</html> |