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<h5 class="subsubsection">9.28.3.1 Special Characters</h5>
<p><a name="index-line-comment-characters_002c-MMIX-1573"></a><a name="index-MMIX-line-comment-characters-1574"></a>
The characters ‘<samp><span class="samp">*</span></samp>’ and ‘<samp><span class="samp">#</span></samp>’ are line comment characters; each
start a comment at the beginning of a line, but only at the beginning of a
line. A ‘<samp><span class="samp">#</span></samp>’ prefixes a hexadecimal number if found elsewhere on a
line. If a ‘<samp><span class="samp">#</span></samp>’ 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, ‘<samp><span class="samp">%</span></samp>’ and ‘<samp><span class="samp">!</span></samp>’, each start a comment anywhere
on the line. Thus you can't use the ‘<samp><span class="samp">modulus</span></samp>’ and ‘<samp><span class="samp">not</span></samp>’
operators in expressions normally associated with these two characters.
<p>A ‘<samp><span class="samp">;</span></samp>’ is a line separator, treated as a new-line, so separate
instructions can be specified on a single line.
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