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<h5 class="subsubsection">9.28.3.1 Special Characters</h5>

<p><a name="index-line-comment-characters_002c-MMIX-1681"></a><a name="index-MMIX-line-comment-characters-1682"></a>
The characters &lsquo;<samp><span class="samp">*</span></samp>&rsquo; and &lsquo;<samp><span class="samp">#</span></samp>&rsquo; are line comment characters; each
start a comment at the beginning of a line, but only at the beginning of a
line.  A &lsquo;<samp><span class="samp">#</span></samp>&rsquo; prefixes a hexadecimal number if found elsewhere on a
line.  If a &lsquo;<samp><span class="samp">#</span></samp>&rsquo; appears at the start of a line the whole line is
treated as a comment, but the line can also act as a logical line
number directive (see <a href="Comments.html#Comments">Comments</a>) or a preprocessor control command
(see <a href="Preprocessing.html#Preprocessing">Preprocessing</a>).

   <p>Two other characters, &lsquo;<samp><span class="samp">%</span></samp>&rsquo; and &lsquo;<samp><span class="samp">!</span></samp>&rsquo;, each start a comment anywhere
on the line.  Thus you can't use the &lsquo;<samp><span class="samp">modulus</span></samp>&rsquo; and &lsquo;<samp><span class="samp">not</span></samp>&rsquo;
operators in expressions normally associated with these two characters.

   <p>A &lsquo;<samp><span class="samp">;</span></samp>&rsquo; is a line separator, treated as a new-line, so separate
instructions can be specified on a single line.

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