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<a name="Comments"></a>Next:&nbsp;<a rel="next" accesskey="n" href="Symbol-Intro.html#Symbol-Intro">Symbol Intro</a>,
Previous:&nbsp;<a rel="previous" accesskey="p" href="Whitespace.html#Whitespace">Whitespace</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Syntax.html#Syntax">Syntax</a>
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<h3 class="section">3.3 Comments</h3>
<p><a name="index-comments-123"></a>There are two ways of rendering comments to <span class="command">as</span>. In both
cases the comment is equivalent to one space.
<p>Anything from <span class="samp">/*</span> through the next <span class="samp">*/</span> is a comment.
This means you may not nest these comments.
<pre class="smallexample"> /*
The only way to include a newline ('\n') in a comment
is to use this sort of comment.
*/
/* This sort of comment does not nest. */
</pre>
<p><a name="index-line-comment-character-124"></a>Anything from the <dfn>line comment</dfn> character to the next newline
is considered a comment and is ignored. The line comment character is
<span class="samp">;</span> on the ARC;
<span class="samp">@</span> on the ARM;
<span class="samp">;</span> for the H8/300 family;
<span class="samp">;</span> for the HPPA;
<span class="samp">#</span> on the i386 and x86-64;
<span class="samp">#</span> on the i960;
<span class="samp">;</span> for the PDP-11;
<span class="samp">;</span> for picoJava;
<span class="samp">#</span> for Motorola PowerPC;
<span class="samp">!</span> for the Renesas / SuperH SH;
<span class="samp">!</span> on the SPARC;
<span class="samp">#</span> on the ip2k;
<span class="samp">#</span> on the m32c;
<span class="samp">#</span> on the m32r;
<span class="samp">|</span> on the 680x0;
<span class="samp">#</span> on the 68HC11 and 68HC12;
<span class="samp">#</span> on the Vax;
<span class="samp">;</span> for the Z80;
<span class="samp">!</span> for the Z8000;
<span class="samp">#</span> on the V850;
<span class="samp">#</span> for Xtensa systems;
see <a href="Machine-Dependencies.html#Machine-Dependencies">Machine Dependencies</a>.
<!-- FIXME What about i860? -->
<p>On some machines there are two different line comment characters. One
character only begins a comment if it is the first non-whitespace character on
a line, while the other always begins a comment.
<p>The V850 assembler also supports a double dash as starting a comment that
extends to the end of the line.
<p><span class="samp">--</span>;
<p><a name="index-_0023-125"></a><a name="index-lines-starting-with-_0040code_007b_0023_007d-126"></a><a name="index-logical-line-numbers-127"></a>To be compatible with past assemblers, lines that begin with <span class="samp">#</span> have a
special interpretation. Following the <span class="samp">#</span> should be an absolute
expression (see <a href="Expressions.html#Expressions">Expressions</a>): the logical line number of the <em>next</em>
line. Then a string (see <a href="Strings.html#Strings">Strings</a>) is allowed: if present it is a
new logical file name. The rest of the line, if any, should be whitespace.
<p>If the first non-whitespace characters on the line are not numeric,
the line is ignored. (Just like a comment.)
<pre class="smallexample"> # This is an ordinary comment.
# 42-6 "new_file_name" # New logical file name
# This is logical line # 36.
</pre>
<p>This feature is deprecated, and may disappear from future versions
of <span class="command">as</span>.
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