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<html><head><title>XLISP string<=</title>
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</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
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<hr>
<h1>string<=</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlstr.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(string<= <i>string1 string2</i> [<i>key offset</i>] ... )</dt>
<dd><i>stringN</i> - a string expression<br>
<i>key</i> - a keyword [one of :start1 :start2 :end1 :end2]<br>
<i>offset</i> - an optional integer expression for a keyword<br>
returns - a non-<a href="nil.htm">NIL</a> value if <i>string1</i>
is less than or equal to <i>string2</i> in
<a href="../misc/ascii-table.htm">ASCII</a> ordering,
<a href="nil.htm">NIL</a> otherwise<br>
<b>Note:</b> case is significant with this function</dd>
</dl>
<h2>Description</h2>
<p>The 'string<=' [string-less-than-or-equal] function takes two string
arguments. A non-<a href="nil.htm">NIL</a> value is returned if
'string1' is less than or equal to 'string2' in
<a href="../misc/ascii-table.htm">ASCII</a> ordering, otherwise
<a href="nil.htm">NIL</a> is returned. The
non-<a href="nil.htm">NIL</a> value returned is the integer index
of the first character of 'string1' which is
<a href="char-not-greaterp-s.htm">char<=</a> [char-less-than-or-equal] to the
corresponding character of 'string2'. This test is case sensitive, the
character '#\a' is different and of greater
<a href="../misc/ascii-table.htm">ASCII</a> value than '#\A'.</p>
<p>The keyword arguments allow for accessing substrings within 'string1' and
'string2'. The keyword arguments each require a keyword ':start1', ':end1',
':start2' or ':end2' and a single integer expression as a pair with the
keyword first and the integer second. The pairs may be in any order. The
':startN' keywords specify the starting offset of the substring. A value of
0 starts the string at the beginning [no offset]. The ':endN' keywords
specify the ending offset of the substring. A value of 3 ends the string
after the 3rd character [an offset of 3 characters].</p>
<h2>Examples</h2>
<pre class="example">
(string<= "a" "b") <font color="#008844">; returns 0</font>
(string<= "a" "a") <font color="#008844">; returns 1</font>
(string<= "a" "A") <font color="#008844">; returns NIL</font>
(string<= "A" "a") <font color="#008844">; returns 0</font>
(string<= "abc" "abc ") <font color="#008844">; returns 3</font>
(string<= "1234567" "1234qrst") <font color="#008844">; returns 4</font>
(string<= "J Smith" "K Smith" :start1 1 :start2 1) <font color="#008844">; strip off the first chars</font>
<font color="#008844">; returns 7</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-025.htm#string-less-than-or-equal">string<=</a>
function in the <nobr>XLISP 2.0</nobr> manual.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
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