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<html><head>
<title>SAL</title>
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color: #000000;
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border-style: solid;
border-width: 1px;
}
</style>
</head>
<body>
<a href="xlisp-man-index.htm">XLISP</a>
<hr>
<h1>SAL</h1>
<hr>
<h2>Data Types</h2>
<hr>
<p>Data types used in SAL and XLISP:</p>
<p><table cellpadding="0" cellspacing="2"><tbody>
<tr>
<td><nobr><code> </code></nobr></td>
<td colspan="2"></td>
<td align="center" colspan="2">SAL</td>
<td align="center" colspan="2">XLISP</td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td align="right"><nobr>integer:</nobr></td>
<td><nobr> </nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>1</code></nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>1</code></nobr></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td align="right"><nobr>float:</nobr></td>
<td><nobr> </nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>1.0</code></nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>1.0</code></nobr></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td align="right"><nobr>string:</nobr></td>
<td><nobr> </nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>"hello"</code></nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>"hello"</code></nobr></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td align="right"><nobr>symbol:</nobr></td>
<td><nobr> </nobr></td>
<td align="center" class="button" colspan="2"><nobr><code><font color="#0000CC">name</font></code></nobr></td>
<td align="center" class="button" colspan="2"><nobr><code><font color="#0000CC">name</font></code></nobr></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td align="right"><nobr>keyword:</nobr></td>
<td><nobr> </nobr></td>
<td align="center" class="button" colspan="2"><nobr><code><font color="#0000CC">symbol</font>:</code></nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>:<font color="#0000CC">symbol</font></code></nobr></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td align="right"><nobr>list:</nobr></td>
<td><nobr> </nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>{<font color="#0000CC">item-1 item-2</font> ...}</code></nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>(<font color="#0000CC">item-1 item-2</font> ...)</code></nobr></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td align="right"><nobr>array:</nobr></td>
<td><nobr> </nobr></td>
<td align="center" class="button" colspan="2"><nobr><code><font color="#0000CC">array</font>[<font color="#0000CC">index</font>]</code></nobr></td>
<td align="center" class="button" colspan="2"><nobr><code>(aref <font color="#0000CC">array index</font>)</code></nobr></td>
</tr>
<tr>
<td><nobr><code> </code></nobr></td>
<td align="right"><nobr>boolean:</nobr></td>
<td><nobr> </nobr></td>
<td align="center" class="button"><nobr><code><font color="#008844">#t</font></code></nobr></td>
<td align="center" class="button"><nobr><code><font color="#AA0000">#f</font></code></nobr></td>
<td align="center" class="button"><nobr><code> <font color="#008844">t</font> </code></nobr></td>
<td align="center" class="button"><nobr><code><font color="#AA0000">nil</font></code></nobr></td>
</tr>
</tbody></table></p>
<p>Data types with different concepts:</p>
<p>SAL:</p>
<ul>
<li>expressions - evaluated to produce a return value</li>
<li>statements - evaluated for side-effects</li>
</ul>
<p>XLISP:</p>
<ul>
<li>character - a single ASCII character</li>
<li>object - the XLISP object system</li>
<li>stream - data type of unknown length</li>
<li>subr - built-in function</li>
<li>fsubr - special form</li>
<li>closure - user defined function</li>
</ul>
<p>A function to print the Lisp code, produced by the SAL compiler, to the
screen:</p>
<pre class="example">
(defun <font color="#0000CC">test</font> (string)
(if (not (stringp string))
(error "not a string" string)
(pprint (third (second (sal-compile string nil nil "<console>"))))))
</pre>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<hr>
<br>
</body></html>
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