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<html><head>
<title>Octal Integer Numbers</title>
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<hr>
<h1>Octal Integer Numbers</h1>
<hr>
<p>XLISP provides the <a href="../manual/xlisp.htm#octal">#o</a>
<nobr>read-macro</nobr> for octal numbers:</p>
<pre class="example">
#o0 => 0 #o10 => 8 #o20 => 16
#o1 => 1 #o11 => 9 #o21 => 17
#o2 => 2 #o12 => 10 #o22 => 18
#o3 => 3 #o13 => 11 #o23 => 19
#o4 => 4 #o14 => 12 #o24 => 20
#o5 => 5 #o15 => 13 #o25 => 21
#o6 => 6 #o16 => 14 #o26 => 22
#o7 => 7 #o17 => 15 #o27 => 23
</pre>
<p><div class="box">
<dl>
<dt>(<b>oct-string</b> <i>integer</i> [<i>all</i>])</dt>
<dd><i>integer</i> - an integer expression<br>
<i>all</i> - a boolean expression<br>
returns - the <i>integer</i> in octal form as string</dd>
</dl>
</div></p>
<pre class="example">
(defun <font color="#0000CC">oct-string</font> (integer &optional all)
(if (integerp integer)
(let ((fmt (if all
(or (dolist (bits '(16 32 64 128) nil)
(let ((fixnum (round (expt 2.0 (1- bits)))))
(and (plusp (1- fixnum))
(minusp fixnum)
(return (format nil <font color="#880000">"%.~ao"</font>
(1+ (/ bits 3)))))))
(error <font color="#880000">"integer limit not found"</font>))
<font color="#880000">"%o"</font>)))
(progv '(<font color="#AA5500">*integer-format*</font>) (list fmt)
(format nil <font color="#880000">"~a"</font> integer)))
(error <font color="#880000">"not an integer"</font> integer)))
</pre>
<p>The '<nobr>oct-string</nobr>' function converts the 'integer' argument
into octal form and returns is as a string. <nobr>If the</nobr>
optional 'all' argument is not given or
<a href="../reference/nil.htm">NIL</a>, leading zeros are not included in
the string. <nobr>If the</nobr> optional 'all' argument is
<nobr>non-<a href="../reference/nil.htm">NIL</a></nobr>, all digits of the
internal representation of the 'integer' argument, including leading zeros,
are contained in the string. This is useful for debugging integer overflow
and <nobr>bit-wise</nobr> functions.</p>
<p><div class="box">
<dl>
<dt>(<b>oct</b> <i>integer</i> [<i>all</i>])</dt>
<dd><i>integer</i> - an integer expression<br>
<i>all</i> - a boolean expression<br>
prints - the <i>integer</i> in octal form<br>
returns - the <i>integer</i> argument</dd>
</dl>
</div></p>
<pre class="example">
(defun <font color="#0000CC">oct</font> (integer &optional all)
(if (integerp integer)
(format t <font color="#880000">"#o~a~%"</font> (oct-string integer all))
(format t <font color="#880000">";; not an integer~%"</font>))
integer)
</pre>
<p>The 'oct' function prints the 'integer' argument in octal form on
the screen. Together with the
<a href="../manual/xlisp.htm#octal">#o</a> <nobr>read-macro</nobr>
this can be used for interactive octal computations.</p>
<pre class="example">
> (oct 12345678)
#o57060516
12345678
</pre>
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