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<p>
Next: <a href="ATB_005f.html#ATB_005f" accesskey="n" rel="next">ATB_</a>, Previous: <a href="ATA_005f.html#ATA_005f" accesskey="p" rel="prev">ATA_</a>, Up: <a href="AT-commands.html#AT-commands" accesskey="u" rel="up">AT commands</a> [<a href="Parameter-index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-index.html#Concept-index" title="Index" rel="index">Index</a>]</p>
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<a name="g_t_0040a_003a-Begin-code-part-of-unnamed-section_002c-and-mark"></a>
<h4 class="subsection">5.4.4 ‘<samp>@a</samp>’: Begin code part of unnamed section, and mark</h4>
<a name="index-_0040a"></a>
<a name="index-Code-part_002c-beginning-unnamed-1"></a>
<p>‘<samp>@a</samp>’ begins the code part of an unnamed section (just as does
‘<samp>@A</samp>’), and in addition marks the next unreserved identifier it
finds as defined in this section. Precisely,
</p>
<div class="example">
<pre class="example">‘<samp>@a</samp>’ == ‘<samp>@A@[</samp>’
</pre></div>
<p>Originally, <small>FWEB</small> did not contain the ‘<samp>@A</samp>’ command, so when
the functionality of automatically marking the next unreserved
identifier (see <a href="AT_005b.html#AT_005b">AT[</a>) was added, it was natural to add it to ‘<samp>@a</samp>’. A
reasonable style of coding is to always use ‘<samp>@a</samp>’ if you don’t know
any better; if you sometime run into trouble, you can then change
selected ‘<samp>@a</samp>’s to ‘<samp>@A</samp>’s. For example, it is appropriate to
use ‘<samp>@a</samp>’ if one codes one function per section. E.g.,
</p>
<div class="example">
<pre class="example">@c
@
@a
int
subrtn()
{}
</pre></div>
<p>Here the ‘<samp>@a</samp>’ marks ‘<samp>subrtn</samp>’ as defined in this section; if
that identifier is used elsewhere, it will be subscripted with the
section number. (To turn this feature off, use ‘<samp>-f</samp>’; see <a href="_002df.html#g_t_002df">-f</a>.)
However, if a section contains an arbitrary code fragment, the code part should
probably begin with ‘<samp>@A</samp>’. E.g.,
</p>
<div class="example">
<pre class="example">@c
@
@A
x = y;
</pre></div>
<p>If one had used ‘<samp>@a</samp>’ here, the <code>x</code> would have been marked as
defined here, which is not what one wants.
</p>
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