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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>1.2 Choosing a Language</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">►</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Dr<span class="mywbr"> </span>Racket:<span class="mywbr"> </span> The Racket Programming Environment</a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="interface-essentials.html" class="tocviewselflink" data-pltdoc="x">Interface Essentials</a></td></tr><tr><td align="right">2 </td><td><a href="languages.html" class="tocviewlink" data-pltdoc="x">Languages</a></td></tr><tr><td align="right">3 </td><td><a href="Interface_Reference.html" class="tocviewlink" data-pltdoc="x">Interface Reference</a></td></tr><tr><td align="right">4 </td><td><a href="extending-drracket.html" class="tocviewlink" data-pltdoc="x">Extending Dr<span class="mywbr"> </span>Racket</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">▼</a></td><td>1 </td><td><a href="interface-essentials.html" class="tocviewlink" data-pltdoc="x">Interface Essentials</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">1.1 </td><td><a href="buttons.html" class="tocviewlink" data-pltdoc="x">Buttons</a></td></tr><tr><td align="right">1.2 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Choosing a Language</a></td></tr><tr><td align="right">1.3 </td><td><a href="editor.html" class="tocviewlink" data-pltdoc="x">Editing with Parentheses</a></td></tr><tr><td align="right">1.4 </td><td><a href="Searching.html" class="tocviewlink" data-pltdoc="x">Searching</a></td></tr><tr><td align="right">1.5 </td><td><a href="Tabbed_Editing.html" class="tocviewlink" data-pltdoc="x">Tabbed Editing</a></td></tr><tr><td align="right">1.6 </td><td><a href="interactions-window.html" class="tocviewlink" data-pltdoc="x">The Interactions Window</a></td></tr><tr><td align="right">1.7 </td><td><a href="Graphical_Syntax.html" class="tocviewlink" data-pltdoc="x">Graphical Syntax</a></td></tr><tr><td align="right">1.8 </td><td><a href="debugger.html" class="tocviewlink" data-pltdoc="x">Graphical Debugging Interface</a></td></tr><tr><td align="right">1.9 </td><td><a href="module-browser.html" class="tocviewlink" data-pltdoc="x">The Module Browser</a></td></tr><tr><td align="right">1.10 </td><td><a href="color-scheme.html" class="tocviewlink" data-pltdoc="x">Color Schemes</a></td></tr><tr><td align="right">1.11 </td><td><a href="create-exe.html" class="tocviewlink" data-pltdoc="x">Creating Executables</a></td></tr><tr><td align="right">1.12 </td><td><a href="follow-log.html" class="tocviewlink" data-pltdoc="x">Following Log Messages</a></td></tr></table></div></div></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="buttons.html" title="backward to "1.1 Buttons"" data-pltdoc="x">← prev</a> <a href="interface-essentials.html" title="up to "1 Interface Essentials"" data-pltdoc="x">up</a> <a href="editor.html" title="forward to "1.3 Editing with Parentheses"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "scribblings/drracket/drracket.scrbl")" x-part-tag=""choose-language"">1.2<tt> </tt><a name="(part._choose-language)"></a><a name="(idx._(gentag._16._(lib._scribblings/drracket/drracket..scrbl)))"></a>Choosing a Language</h4><p>DrRacket supports multiple dialects of Racket, as well as some
non-Racket languages. You specify a language in one of two ways:</p><ul><li><p>Select the <span class="ssansserif">Use the language declared in the source</span>
option (via the <span class="ssansserif">Language|Choose Language...</span> menu
item), and then specify a specific language as part of the
program usually by starting the definitions-window content with
<a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=guide&rel=Module_Syntax.html%23%2528part._hash-lang%2529&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktMod">#lang</span></a>.</p></li><li><p>Select the <span class="ssansserif">Language|Choose Language...</span> menu
item, and choose a specific language. After changing the
language, click <span class="ssansserif">Run</span> to reset the language in the
interactions window. The bottom-left corner of DrRacket’s main
window also has a shortcut menu item for selecting previously
selected languages.</p></li></ul><p>Using a language declared in a program’s source is the recommend mode,
and it is described further in <a href="module.html" data-pltdoc="x">Language Declared in Source</a>.</p><p>The <span class="ssansserif">Language|Choose Language...</span> dialog contains a
<span class="ssansserif">Show Details</span> button for configuring certain details of the
chosen language. Whenever the selected options do not match the
default language specification, a <span class="ssansserif">Custom</span> indicator appears
next to the language-selection control at the top of the dialog.</p><p>See <a href="languages.html" data-pltdoc="x">Languages</a> (later in this manual) for more information
on the languages that DrRacket supports.</p><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="buttons.html" title="backward to "1.1 Buttons"" data-pltdoc="x">← prev</a> <a href="interface-essentials.html" title="up to "1 Interface Essentials"" data-pltdoc="x">up</a> <a href="editor.html" title="forward to "1.3 Editing with Parentheses"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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