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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `LowerExp` trait in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, LowerExp"><title>std::fmt::LowerExp - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../light1.35.0.css" id="themeStyle"><script src="../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../std/index.html'><img src='../../rust-logo1.35.0.png' alt='logo' width='100'></a><p class='location'>Trait LowerExp</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.fmt">fmt</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>std</a>::<wbr><a href='index.html'>fmt</a></p><script>window.sidebarCurrent = {name: 'LowerExp', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='../../src/core/fmt/mod.rs.html#916-920' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>std</a>::<wbr><a href='index.html'>fmt</a>::<wbr><a class="trait" href=''>LowerExp</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait LowerExp {
    fn <a href='#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../../std/fmt/struct.Formatter.html" title="struct std::fmt::Formatter">Formatter</a>) -&gt; <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a>&lt;<a class="primitive" href="../primitive.unit.html">()</a>, <a class="struct" href="../../std/fmt/struct.Error.html" title="struct std::fmt::Error">Error</a>&gt;;
}</pre></div><div class='docblock'><p><code>e</code> formatting.</p>
<p>The <code>LowerExp</code> trait should format its output in scientific notation with a lower-case <code>e</code>.</p>
<p>For more information on formatters, see <a href="../../std/fmt/index.html">the module-level documentation</a>.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>Basic usage with <code>i32</code>:</p>

<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="number">42.0</span>; <span class="comment">// 42.0 is &#39;4.2e1&#39; in scientific notation</span>

<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:e}&quot;</span>, <span class="ident">x</span>), <span class="string">&quot;4.2e1&quot;</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20x%20%3D%2042.0%3B%20%2F%2F%2042.0%20is%20'4.2e1'%20in%20scientific%20notation%0A%0Aassert_eq!(format!(%22%7B%3Ae%7D%22%2C%20x)%2C%20%224.2e1%22)%3B%0A%7D">Run</a></pre></div>
<p>Implementing <code>LowerExp</code> on a type:</p>

<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;

<span class="kw">struct</span> <span class="ident">Length</span>(<span class="ident">i32</span>);

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">LowerExp</span> <span class="kw">for</span> <span class="ident">Length</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="self">self</span>.<span class="number">0</span>;
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;{}e1&quot;</span>, <span class="ident">val</span> <span class="op">/</span> <span class="number">10</span>)
    }
}

<span class="kw">let</span> <span class="ident">l</span> <span class="op">=</span> <span class="ident">Length</span>(<span class="number">100</span>);

<span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;l in scientific notation is: {:e}&quot;</span>, <span class="ident">l</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Afmt%3B%0A%0Astruct%20Length(i32)%3B%0A%0Aimpl%20fmt%3A%3ALowerExp%20for%20Length%20%7B%0A%20%20%20%20fn%20fmt(%26self%2C%20f%3A%20%26mut%20fmt%3A%3AFormatter)%20-%3E%20fmt%3A%3AResult%20%7B%0A%20%20%20%20%20%20%20%20let%20val%20%3D%20self.0%3B%0A%20%20%20%20%20%20%20%20write!(f%2C%20%22%7B%7De1%22%2C%20val%20%2F%2010)%0A%20%20%20%20%7D%0A%7D%0A%0Alet%20l%20%3D%20Length(100)%3B%0A%0Aprintln!(%22l%20in%20scientific%20notation%20is%3A%20%7B%3Ae%7D%22%2C%20l)%3B%0A%7D">Run</a></pre></div>
</div>
            <h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.fmt' class='method'><code id='fmt.v'>fn <a href='#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../../std/fmt/struct.Formatter.html" title="struct std::fmt::Formatter">Formatter</a>) -&gt; <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a>&lt;<a class="primitive" href="../primitive.unit.html">()</a>, <a class="struct" href="../../std/fmt/struct.Error.html" title="struct std::fmt::Error">Error</a>&gt;</code></h3><div class='docblock'><p>Formats the value using the given formatter.</p>
</div></div><span class='loading-content'>Loading content...</span>
            <h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-LowerExp' class='impl'><code class='in-band'>impl LowerExp for <a class="primitive" href="../primitive.f32.html">f32</a></code><a href='#impl-LowerExp' class='anchor'></a><a class='srclink' href='../../src/core/fmt/float.rs.html#139-143' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt' class="method hidden"><code id='fmt.v-1'>fn <a href='#method.fmt' class='fnname'>fmt</a>(&amp;self, fmt: &amp;mut <a class="struct" href="../../std/fmt/struct.Formatter.html" title="struct std::fmt::Formatter">Formatter</a>) -&gt; <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a>&lt;<a class="primitive" href="../primitive.unit.html">()</a>, <a class="struct" href="../../std/fmt/struct.Error.html" title="struct std::fmt::Error">Error</a>&gt;</code><a class='srclink' href='../../src/core/fmt/float.rs.html#140-142' title='goto source code'>[src]</a></h4></div><h3 id='impl-LowerExp-1' class='impl'><code class='in-band'>impl LowerExp for <a class="primitive" href="../primitive.f64.html">f64</a></code><a href='#impl-LowerExp-1' class='anchor'></a><a class='srclink' href='../../src/core/fmt/float.rs.html#139-143' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt-1' class="method hidden"><code id='fmt.v-2'>fn <a href='#method.fmt-1' class='fnname'>fmt</a>(&amp;self, fmt: &amp;mut <a class="struct" href="../../std/fmt/struct.Formatter.html" title="struct std::fmt::Formatter">Formatter</a>) -&gt; <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a>&lt;<a class="primitive" href="../primitive.unit.html">()</a>, <a class="struct" href="../../std/fmt/struct.Error.html" title="struct std::fmt::Error">Error</a>&gt;</code><a class='srclink' href='../../src/core/fmt/float.rs.html#140-142' title='goto source code'>[src]</a></h4></div><h3 id='impl-LowerExp-2' class='impl'><code class='in-band'>impl&lt;'_, T&gt; LowerExp for <a class="primitive" href="../primitive.reference.html">&amp;'_ </a>T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../std/fmt/trait.LowerExp.html" title="trait std::fmt::LowerExp">LowerExp</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,&nbsp;</span></code><a href='#impl-LowerExp-2' class='anchor'></a><a class='srclink' href='../../src/core/fmt/mod.rs.html#1913-1915' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt-2' class="method hidden"><code id='fmt.v-3'>fn <a href='#method.fmt-2' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../../std/fmt/struct.Formatter.html" title="struct std::fmt::Formatter">Formatter</a>) -&gt; <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a>&lt;<a class="primitive" href="../primitive.unit.html">()</a>, <a class="struct" href="../../std/fmt/struct.Error.html" title="struct std::fmt::Error">Error</a>&gt;</code><a class='srclink' href='../../src/core/fmt/mod.rs.html#1914' title='goto source code'>[src]</a></h4></div><h3 id='impl-LowerExp-3' class='impl'><code class='in-band'>impl&lt;'_, T&gt; LowerExp for <a class="primitive" href="../primitive.reference.html">&amp;'_ mut </a>T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../std/fmt/trait.LowerExp.html" title="trait std::fmt::LowerExp">LowerExp</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,&nbsp;</span></code><a href='#impl-LowerExp-3' class='anchor'></a><a class='srclink' href='../../src/core/fmt/mod.rs.html#1917-1919' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt-3' class="method hidden"><code id='fmt.v-4'>fn <a href='#method.fmt-3' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../../std/fmt/struct.Formatter.html" title="struct std::fmt::Formatter">Formatter</a>) -&gt; <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a>&lt;<a class="primitive" href="../primitive.unit.html">()</a>, <a class="struct" href="../../std/fmt/struct.Error.html" title="struct std::fmt::Error">Error</a>&gt;</code><a class='srclink' href='../../src/core/fmt/mod.rs.html#1918' title='goto source code'>[src]</a></h4></div></div><span class='loading-content'>Loading content...</span><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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