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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>How to Design Programs Languages</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,&quot;tocview_0&quot;);">&#9660;</a></td><td></td><td><a href="" class="tocviewselflink" data-pltdoc="x"><span style="font-style: italic">How to Design Programs</span> Languages</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="beginner.html" class="tocviewlink" data-pltdoc="x">Beginning Student</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="beginner-abbr.html" class="tocviewlink" data-pltdoc="x">Beginning Student with List Abbreviations</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="intermediate.html" class="tocviewlink" data-pltdoc="x">Intermediate Student</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="intermediate-lam.html" class="tocviewlink" data-pltdoc="x">Intermediate Student with Lambda</a></td></tr><tr><td align="right">5&nbsp;</td><td><a href="advanced.html" class="tocviewlink" data-pltdoc="x">Advanced Student</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber"></span><a href="#%28part._top%29" class="tocsubseclink" data-pltdoc="x"><span style="font-style: italic">How to Design Programs</span> Languages</a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.1</span></div><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, &quot;6.1&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { this.style.color=&quot;#888&quot;; this.style.textAlign=&quot;center&quot;; this.value=&quot;...search manuals...&quot;; }"/></form>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">top</a></span><span class="navright">&nbsp;&nbsp;<span class="nonavigation">&larr; prev</span>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">up</a>&nbsp;&nbsp;<a href="beginner.html" title="forward to &quot;1 Beginning Student&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div><h2 x-source-module="(lib &quot;scribblings/htdp-langs/htdp-langs.scrbl&quot;)" x-part-tag="&quot;top&quot;"><a name="(part._top)"></a><span style="font-style: italic">How to Design Programs</span> Languages</h2><p>The languages documented in this manual are provided by DrRacket to be
used with the <span style="font-style: italic"><a href="http://www.htdp.org/">How to Design
Programs</a></span> book.</p><p>When programs in these languages are run in DrRacket, any part of the
program that was not run is highlighted in orange and black. These
colors are intended to give the programmer feedback about the parts of
the program that have not been tested. To avoid seeing these colors,
use <span class="RktSym"><a href="beginner.html#%28form._%28%28lib._lang%2Fhtdp-beginner..rkt%29._check-expect%29%29" class="RktStxLink" data-pltdoc="x">check-expect</a></span> to test your program. Of course, just
because you see no colors, does not mean that your program has been
fully tested; it simply means that each part of the program has been run
(at least once).</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html" class="toptoclink" data-pltdoc="x">1<span class="hspace">&nbsp;</span>Beginning Student</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._beginner._.Pre-.Defined._.Variables%29" class="toclink" data-pltdoc="x">1.1<span class="hspace">&nbsp;</span>Pre-Defined Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._beginner._.Template._.Variables%29" class="toclink" data-pltdoc="x">1.2<span class="hspace">&nbsp;</span>Template Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._beginner-syntax%29" class="toclink" data-pltdoc="x">1.3<span class="hspace">&nbsp;</span>Syntax</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._beginner-pre-defined%29" class="toclink" data-pltdoc="x">1.4<span class="hspace">&nbsp;</span>Pre-defined Functions</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._htdp-beginner._.Numbers__.Integers__.Rationals__.Reals__.Complex__.Exacts__.Inexacts%29" class="toclink" data-pltdoc="x">1.5<span class="hspace">&nbsp;</span>Numbers: Integers, Rationals, Reals, Complex, Exacts, Inexacts</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._htdp-beginner._.Booleans%29" class="toclink" data-pltdoc="x">1.6<span class="hspace">&nbsp;</span>Booleans</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._htdp-beginner._.Symbols%29" class="toclink" data-pltdoc="x">1.7<span class="hspace">&nbsp;</span>Symbols</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._htdp-beginner._.Lists%29" class="toclink" data-pltdoc="x">1.8<span class="hspace">&nbsp;</span>Lists</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._htdp-beginner._.Posns%29" class="toclink" data-pltdoc="x">1.9<span class="hspace">&nbsp;</span>Posns</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._htdp-beginner._.Characters%29" class="toclink" data-pltdoc="x">1.10<span class="hspace">&nbsp;</span>Characters</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._htdp-beginner._.Strings%29" class="toclink" data-pltdoc="x">1.11<span class="hspace">&nbsp;</span>Strings</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._htdp-beginner._.Images%29" class="toclink" data-pltdoc="x">1.12<span class="hspace">&nbsp;</span>Images</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner.html#%28part._htdp-beginner._.Misc%29" class="toclink" data-pltdoc="x">1.13<span class="hspace">&nbsp;</span>Misc</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html" class="toptoclink" data-pltdoc="x">2<span class="hspace">&nbsp;</span>Beginning Student with List Abbreviations</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._beginner-abbr._.Pre-.Defined._.Variables%29" class="toclink" data-pltdoc="x">2.1<span class="hspace">&nbsp;</span>Pre-Defined Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._beginner-abbr._.Template._.Variables%29" class="toclink" data-pltdoc="x">2.2<span class="hspace">&nbsp;</span>Template Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._beginner-abbr-syntax%29" class="toclink" data-pltdoc="x">2.3<span class="hspace">&nbsp;</span>Syntaxes for Beginning Student with List Abbreviations</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._beginner-abbr-common-syntax%29" class="toclink" data-pltdoc="x">2.4<span class="hspace">&nbsp;</span>Common Syntaxes</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._beginner-abbr-pre-defined%29" class="toclink" data-pltdoc="x">2.5<span class="hspace">&nbsp;</span>Pre-defined Functions</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._htdp-beginner-abbr._.Numbers__.Integers__.Rationals__.Reals__.Complex__.Exacts__.Inexacts%29" class="toclink" data-pltdoc="x">2.6<span class="hspace">&nbsp;</span>Numbers: Integers, Rationals, Reals, Complex, Exacts, Inexacts</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._htdp-beginner-abbr._.Booleans%29" class="toclink" data-pltdoc="x">2.7<span class="hspace">&nbsp;</span>Booleans</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._htdp-beginner-abbr._.Symbols%29" class="toclink" data-pltdoc="x">2.8<span class="hspace">&nbsp;</span>Symbols</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._htdp-beginner-abbr._.Lists%29" class="toclink" data-pltdoc="x">2.9<span class="hspace">&nbsp;</span>Lists</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._htdp-beginner-abbr._.Posns%29" class="toclink" data-pltdoc="x">2.10<span class="hspace">&nbsp;</span>Posns</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._htdp-beginner-abbr._.Characters%29" class="toclink" data-pltdoc="x">2.11<span class="hspace">&nbsp;</span>Characters</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._htdp-beginner-abbr._.Strings%29" class="toclink" data-pltdoc="x">2.12<span class="hspace">&nbsp;</span>Strings</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._htdp-beginner-abbr._.Images%29" class="toclink" data-pltdoc="x">2.13<span class="hspace">&nbsp;</span>Images</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="beginner-abbr.html#%28part._htdp-beginner-abbr._.Misc%29" class="toclink" data-pltdoc="x">2.14<span class="hspace">&nbsp;</span>Misc</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html" class="toptoclink" data-pltdoc="x">3<span class="hspace">&nbsp;</span>Intermediate Student</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._intermediate._.Pre-.Defined._.Variables%29" class="toclink" data-pltdoc="x">3.1<span class="hspace">&nbsp;</span>Pre-Defined Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._intermediate._.Template._.Variables%29" class="toclink" data-pltdoc="x">3.2<span class="hspace">&nbsp;</span>Template Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._intermediate-syntax%29" class="toclink" data-pltdoc="x">3.3<span class="hspace">&nbsp;</span>Syntax for Intermediate</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._intermediate-common-syntax%29" class="toclink" data-pltdoc="x">3.4<span class="hspace">&nbsp;</span>Common Syntaxes</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._intermediate-pre-defined%29" class="toclink" data-pltdoc="x">3.5<span class="hspace">&nbsp;</span>Pre-defined Functions</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Numbers__.Integers__.Rationals__.Reals__.Complex__.Exacts__.Inexacts%29" class="toclink" data-pltdoc="x">3.6<span class="hspace">&nbsp;</span>Numbers: Integers, Rationals, Reals, Complex, Exacts, Inexacts</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Booleans%29" class="toclink" data-pltdoc="x">3.7<span class="hspace">&nbsp;</span>Booleans</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Symbols%29" class="toclink" data-pltdoc="x">3.8<span class="hspace">&nbsp;</span>Symbols</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Lists%29" class="toclink" data-pltdoc="x">3.9<span class="hspace">&nbsp;</span>Lists</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Posns%29" class="toclink" data-pltdoc="x">3.10<span class="hspace">&nbsp;</span>Posns</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Characters%29" class="toclink" data-pltdoc="x">3.11<span class="hspace">&nbsp;</span>Characters</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Strings%29" class="toclink" data-pltdoc="x">3.12<span class="hspace">&nbsp;</span>Strings</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Images%29" class="toclink" data-pltdoc="x">3.13<span class="hspace">&nbsp;</span>Images</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Misc%29" class="toclink" data-pltdoc="x">3.14<span class="hspace">&nbsp;</span>Misc</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Numbers__relaxed_conditions_%29" class="toclink" data-pltdoc="x">3.15<span class="hspace">&nbsp;</span>Numbers (relaxed conditions)</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate.html#%28part._htdp-intermediate._.Higher-.Order_.Functions%29" class="toclink" data-pltdoc="x">3.16<span class="hspace">&nbsp;</span>Higher-Order Functions</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html" class="toptoclink" data-pltdoc="x">4<span class="hspace">&nbsp;</span>Intermediate Student with Lambda</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._intm-w-lambda._.Pre-.Defined._.Variables%29" class="toclink" data-pltdoc="x">4.1<span class="hspace">&nbsp;</span>Pre-Defined Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._intm-w-lambda._.Template._.Variables%29" class="toclink" data-pltdoc="x">4.2<span class="hspace">&nbsp;</span>Template Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._intm-w-lambda-syntax%29" class="toclink" data-pltdoc="x">4.3<span class="hspace">&nbsp;</span>Syntax for Intermediate with Lambda</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._intm-w-lambda-common-syntax%29" class="toclink" data-pltdoc="x">4.4<span class="hspace">&nbsp;</span>Common Syntaxes</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._intm-w-lambda-pre-defined%29" class="toclink" data-pltdoc="x">4.5<span class="hspace">&nbsp;</span>Pre-defined Functions</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Numbers__.Integers__.Rationals__.Reals__.Complex__.Exacts__.Inexacts%29" class="toclink" data-pltdoc="x">4.6<span class="hspace">&nbsp;</span>Numbers: Integers, Rationals, Reals, Complex, Exacts, Inexacts</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Booleans%29" class="toclink" data-pltdoc="x">4.7<span class="hspace">&nbsp;</span>Booleans</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Symbols%29" class="toclink" data-pltdoc="x">4.8<span class="hspace">&nbsp;</span>Symbols</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Lists%29" class="toclink" data-pltdoc="x">4.9<span class="hspace">&nbsp;</span>Lists</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Posns%29" class="toclink" data-pltdoc="x">4.10<span class="hspace">&nbsp;</span>Posns</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Characters%29" class="toclink" data-pltdoc="x">4.11<span class="hspace">&nbsp;</span>Characters</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Strings%29" class="toclink" data-pltdoc="x">4.12<span class="hspace">&nbsp;</span>Strings</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Images%29" class="toclink" data-pltdoc="x">4.13<span class="hspace">&nbsp;</span>Images</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Misc%29" class="toclink" data-pltdoc="x">4.14<span class="hspace">&nbsp;</span>Misc</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Numbers__relaxed_conditions_%29" class="toclink" data-pltdoc="x">4.15<span class="hspace">&nbsp;</span>Numbers (relaxed conditions)</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="intermediate-lam.html#%28part._htdp-intermediate-lambda._.Higher-.Order_.Functions%29" class="toclink" data-pltdoc="x">4.16<span class="hspace">&nbsp;</span>Higher-Order Functions</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html" class="toptoclink" data-pltdoc="x">5<span class="hspace">&nbsp;</span>Advanced Student</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._advanced._.Pre-.Defined._.Variables%29" class="toclink" data-pltdoc="x">5.1<span class="hspace">&nbsp;</span>Pre-Defined Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._advanced._.Template._.Variables%29" class="toclink" data-pltdoc="x">5.2<span class="hspace">&nbsp;</span>Template Variables</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._advanced-syntax%29" class="toclink" data-pltdoc="x">5.3<span class="hspace">&nbsp;</span>Syntax for Advanced</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._advanced-common-syntax%29" class="toclink" data-pltdoc="x">5.4<span class="hspace">&nbsp;</span>Common Syntaxes</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._advanced-pre-defined%29" class="toclink" data-pltdoc="x">5.5<span class="hspace">&nbsp;</span>Pre-Defined Functions</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Numbers__.Integers__.Rationals__.Reals__.Complex__.Exacts__.Inexacts%29" class="toclink" data-pltdoc="x">5.6<span class="hspace">&nbsp;</span>Numbers: Integers, Rationals, Reals, Complex, Exacts, Inexacts</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Booleans%29" class="toclink" data-pltdoc="x">5.7<span class="hspace">&nbsp;</span>Booleans</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Symbols%29" class="toclink" data-pltdoc="x">5.8<span class="hspace">&nbsp;</span>Symbols</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Lists%29" class="toclink" data-pltdoc="x">5.9<span class="hspace">&nbsp;</span>Lists</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Posns%29" class="toclink" data-pltdoc="x">5.10<span class="hspace">&nbsp;</span>Posns</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Characters%29" class="toclink" data-pltdoc="x">5.11<span class="hspace">&nbsp;</span>Characters</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Strings%29" class="toclink" data-pltdoc="x">5.12<span class="hspace">&nbsp;</span>Strings</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Images%29" class="toclink" data-pltdoc="x">5.13<span class="hspace">&nbsp;</span>Images</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Misc%29" class="toclink" data-pltdoc="x">5.14<span class="hspace">&nbsp;</span>Misc</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Numbers__relaxed_conditions_%29" class="toclink" data-pltdoc="x">5.15<span class="hspace">&nbsp;</span>Numbers (relaxed conditions)</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Higher-.Order_.Functions%29" class="toclink" data-pltdoc="x">5.16<span class="hspace">&nbsp;</span>Higher-Order Functions</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Reading_and_.Printing%29" class="toclink" data-pltdoc="x">5.17<span class="hspace">&nbsp;</span>Reading and Printing</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Vectors%29" class="toclink" data-pltdoc="x">5.18<span class="hspace">&nbsp;</span>Vectors</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Boxes%29" class="toclink" data-pltdoc="x">5.19<span class="hspace">&nbsp;</span>Boxes</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="advanced.html#%28part._htdp-advanced._.Hash_.Tables%29" class="toclink" data-pltdoc="x">5.20<span class="hspace">&nbsp;</span>Hash Tables</a></p></td></tr></table><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, &quot;6.1&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if 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