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+
+<title>Octal Integer Numbers</title>
+
+<style type="text/css">
+.example {
+ color: #000000;
+ background-color: #F5F5F5;
+ padding: 8px;
+ border: #808080;
+ border-style: solid;
+ border-width: 1px;
+ width:auto;
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+.button {
+ color: #000000;
+ background-color: #F5F5F5;
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 4px;
+ padding-right: 8px;
+ border: #808080;
+ border-style: solid;
+ border-width: 1px;
+ white-space: pre;
+}
+.box {
+ color: #000000;
+ padding-top: 4px;
+ padding-bottom: 4px;
+ padding-left: 16px;
+ padding-right: 16px;
+ border: #808080;
+ border-style: solid;
+ border-width: 1px;
+}
+</style>
+
+</head>
+
+<body>
+
+<a href="../start.htm">Nyquist / XLISP 2.0</a> -
+<a href="../manual/contents.htm">Contents</a> |
+<a href="../tutorials/tutorials.htm">Tutorials</a> |
+<a href="examples.htm">Examples</a> |
+<a href="../reference/reference-index.htm">Reference</a>
+
+<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>
+
+<p><nobr> <a href="#top">Back to top</a></nobr></p>
+
+<hr>
+
+<a href="../start.htm">Nyquist / XLISP 2.0</a> -
+<a href="../manual/contents.htm">Contents</a> |
+<a href="../tutorials/tutorials.htm">Tutorials</a> |
+<a href="examples.htm">Examples</a> |
+<a href="../reference/reference-index.htm">Reference</a>
+
+</body></html>
|