<html lang="en"> <head> <title>Keywords - GNU Octave</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="GNU Octave"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Grammar-and-Parser.html#Grammar-and-Parser" title="Grammar and Parser"> <link rel="next" href="Parser.html#Parser" title="Parser"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Keywords"></a> <p> Next: <a rel="next" accesskey="n" href="Parser.html#Parser">Parser</a>, Up: <a rel="up" accesskey="u" href="Grammar-and-Parser.html#Grammar-and-Parser">Grammar and Parser</a> <hr> </div> <h3 class="section">I.1 Keywords</h3> <p><a name="index-keywords-3461"></a> The following identifiers are keywords, and may not be used as variable or function names: <p><table summary=""><tr align="left"><td valign="top" width="33%"><code>__FILE__</code> </td><td valign="top" width="33%"><code>__LINE__</code> </td><td valign="top" width="33%"><code>break</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>case</code> </td><td valign="top" width="33%"><code>catch</code> </td><td valign="top" width="33%"><code>classdef</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>continue</code> </td><td valign="top" width="33%"><code>do</code> </td><td valign="top" width="33%"><code>else</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>elseif</code> </td><td valign="top" width="33%"><code>end</code> </td><td valign="top" width="33%"><code>end_try_catch</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>end_unwind_protect</code> </td><td valign="top" width="33%"><code>endclassdef</code> </td><td valign="top" width="33%"><code>endenumeration</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>endevents</code> </td><td valign="top" width="33%"><code>endfor</code> </td><td valign="top" width="33%"><code>endfunction</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>endif</code> </td><td valign="top" width="33%"><code>endmethods</code> </td><td valign="top" width="33%"><code>endparfor</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>endproperties</code> </td><td valign="top" width="33%"><code>endswitch</code> </td><td valign="top" width="33%"><code>endwhile</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>enumeration</code> </td><td valign="top" width="33%"><code>events</code> </td><td valign="top" width="33%"><code>for</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>function</code> </td><td valign="top" width="33%"><code>get</code> </td><td valign="top" width="33%"><code>global</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>if</code> </td><td valign="top" width="33%"><code>methods</code> </td><td valign="top" width="33%"><code>otherwise</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>parfor</code> </td><td valign="top" width="33%"><code>persistent</code> </td><td valign="top" width="33%"><code>properties</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>return</code> </td><td valign="top" width="33%"><code>set</code> </td><td valign="top" width="33%"><code>static</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>switch</code> </td><td valign="top" width="33%"><code>try</code> </td><td valign="top" width="33%"><code>until</code> <br></td></tr><tr align="left"><td valign="top" width="33%"><code>unwind_protect</code> </td><td valign="top" width="33%"><code>unwind_protect_cleanup</code> </td><td valign="top" width="33%"><code>while</code> <br></td></tr></table> <p>The function <code>iskeyword</code> can be used to quickly check whether an identifier is reserved by Octave. <!-- iskeyword src/lex.cc --> <p><a name="doc_002diskeyword"></a> <div class="defun"> — Built-in Function: <b>iskeyword</b> ()<var><a name="index-iskeyword-3462"></a></var><br> — Built-in Function: <b>iskeyword</b> (<var>name</var>)<var><a name="index-iskeyword-3463"></a></var><br> <blockquote><p>Return true if <var>name</var> is an Octave keyword. If <var>name</var> is omitted, return a list of keywords. <!-- Texinfo @sp should work but in practice produces ugly results for HTML. --> <!-- A simple blank line produces the correct behavior. --> <!-- @sp 1 --> <p class="noindent"><strong>See also:</strong> <a href="doc_002disvarname.html#doc_002disvarname">isvarname</a>, <a href="doc_002dexist.html#doc_002dexist">exist</a>. </p></blockquote></div> </body></html>