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Previous: <a href="Inserting-a-Backslash.html#Inserting-a-Backslash" accesskey="p" rel="prev">Inserting a Backslash</a>, Up: <a href="Special-Characters.html#Special-Characters" accesskey="u" rel="up">Special Characters</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html#Command-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Inserting-_0060_0023_0027-with-_0040hashchar_007b_007d"></a>
<h4 class="subsection">12.1.5 Inserting ‘#’ with <code>@hashchar{}</code></h4>
<a name="index-hashchar_007b_007d-_0028literal-_0023_0029"></a>
<a name="index-Inserting-_0023"></a>
<a name="index-Hash-sign_002c-inserting"></a>
<p>Ordinarily, a hash ‘#’ is a normal character in Texinfo that can be
simply typed in your input where you need it. The result is to
typeset the hash character from the current font.
</p>
<a name="index-Number-sign_002c-inserting"></a>
<a name="index-Octotherp_002c-inserting"></a>
<a name="index-Sharp-sign-_0028not_0029_002c-inserting"></a>
<p>This character has many other names, varying by locale, such as
“number sign”, “pound”, and “octothorp”. It is also sometimes
called “sharp” or “sharp sign” since it vaguely resembles the
musical symbol by that name. In situations where Texinfo is used,
“hash” is the most common in our experience.
</p>
<p>However, Texinfo uses the hash character as a special character in one
restricted context: to introduce the so-called <code>#line</code> directive
and variants (see <a href="External-Macro-Processors.html#External-Macro-Processors">External Macro Processors</a>).
</p>
<p>So, in order to typeset an actual hash character in such a place (for
example, in a program that needs documentation about <code>#line</code>),
it’s necessary to use <code>@hashchar{}</code> or some other construct.
Here’s an example:
</p>
<div class="example">
<pre class="example">@hashchar{} 10 "example.c"
</pre></div>
<p>Although ‘<samp>@hashchar{}</samp>’ can be used nearly anywhere, there
is no need for it anywhere except this unusual case.
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