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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>1.14 Eigenschaften</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">Sprachebenen und Material zu <span style="font-style: italic">Die Macht der Abstraktion</span></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="DMdA-beginner.html" class="tocviewselflink" data-pltdoc="x">Die Macht der Abstraktion -<wbr></wbr> Anfänger</a></td></tr><tr><td align="right">2 </td><td><a href="DMdA-vanilla.html" class="tocviewlink" data-pltdoc="x">Die Macht der Abstraktion</a></td></tr><tr><td align="right">3 </td><td><a href="DMdA-assignments.html" class="tocviewlink" data-pltdoc="x">Die Macht der Abstraktion mit Zuweisungen</a></td></tr><tr><td align="right">4 </td><td><a href="DMdA-advanced.html" class="tocviewlink" data-pltdoc="x">Die Macht der Abstraktion fortgeschritten</a></td></tr><tr><td align="right">5 </td><td><a href="Konstruktionsanleitungen_1_bis_10.html" class="tocviewlink" data-pltdoc="x">Konstruktionsanleitungen 1 bis 10</a></td></tr><tr><td align="right">6 </td><td><a href="image.html" class="tocviewlink" data-pltdoc="x">Bilder konstruieren:<span class="mywbr"> </span> <span class="stt">"image.ss"</span><a name="(idx._(gentag._2._(lib._deinprogramm/scribblings/deinprogramm..scrbl)))"></a></a></td></tr><tr><td align="right">7 </td><td><a href="world.html" class="tocviewlink" data-pltdoc="x">Animationen:<span class="mywbr"> </span> <span class="stt">"world.ss"</span><a name="(idx._(gentag._3._(lib._deinprogramm/scribblings/deinprogramm..scrbl)))"></a></a></td></tr><tr><td align="right">8 </td><td><a href="turtle.html" class="tocviewlink" data-pltdoc="x">Turtle-<wbr></wbr>Grafik:<span class="mywbr"> </span> <span class="stt">"turtle.ss"</span><a name="(idx._(gentag._4._(lib._deinprogramm/scribblings/deinprogramm..scrbl)))"></a></a></td></tr><tr><td align="right">9 </td><td><a href="sound.html" class="tocviewlink" data-pltdoc="x">Abspielen von Audio-<wbr></wbr>Dateien:<span class="mywbr"> </span> <span class="stt">"sound.ss"</span><a name="(idx._(gentag._5._(lib._deinprogramm/scribblings/deinprogramm..scrbl)))"></a></a></td></tr><tr><td align="right">10 </td><td><a href="line3d.html" class="tocviewlink" data-pltdoc="x">3D-<wbr></wbr>Liniengraphik:<span class="mywbr"> </span> <span class="stt">"line3d.ss"</span><a name="(idx._(gentag._6._(lib._deinprogramm/scribblings/deinprogramm..scrbl)))"></a></a></td></tr><tr><td align="right">11 </td><td><a href="DMdA__Sprachen_als_Libraries.html" class="tocviewlink" data-pltdoc="x"><span style="font-weight: bold">DMd<span class="mywbr"> </span>A</span>:<span class="mywbr"> </span> Sprachen als Libraries</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="DMdA-beginner.html" class="tocviewlink" data-pltdoc="x">Die Macht der Abstraktion -<wbr></wbr> Anfänger</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="Definitionen.html" class="tocviewlink" data-pltdoc="x">Definitionen</a></td></tr><tr><td align="right">1.2 </td><td><a href="Record-Typ-Definitionen.html" class="tocviewlink" data-pltdoc="x">Record-<wbr></wbr>Typ-<wbr></wbr>Definitionen</a></td></tr><tr><td align="right">1.3 </td><td><a href="application.html" class="tocviewlink" data-pltdoc="x">Prozedurapplikation</a></td></tr><tr><td align="right">1.4 </td><td><a href="_t_and__f.html" class="tocviewlink" data-pltdoc="x"><span class="RktVal">#t</span> and <span class="RktVal">#f</span></a></td></tr><tr><td align="right">1.5 </td><td><a href="lambda.html" class="tocviewlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">lambda</span></span></a></td></tr><tr><td align="right">1.6 </td><td><a href="id.html" class="tocviewlink" data-pltdoc="x">Bezeichner</a></td></tr><tr><td align="right">1.7 </td><td><a href="cond.html" class="tocviewlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">cond</span></span></a></td></tr><tr><td align="right">1.8 </td><td><a href="if.html" class="tocviewlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">if</span></span></a></td></tr><tr><td align="right">1.9 </td><td><a href="and.html" class="tocviewlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">and</span></span></a></td></tr><tr><td align="right">1.10 </td><td><a href="or.html" class="tocviewlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">or</span></span></a></td></tr><tr><td align="right">1.11 </td><td><a href="Signaturen.html" class="tocviewlink" data-pltdoc="x">Signaturen</a></td></tr><tr><td align="right">1.12 </td><td><a href="Testf_lle.html" class="tocviewlink" data-pltdoc="x">Testfälle</a></td></tr><tr><td align="right">1.13 </td><td><a href="Parametrische_Record-Typ-Definitionen.html" class="tocviewlink" data-pltdoc="x">Parametrische Record-<wbr></wbr>Typ-<wbr></wbr>Definitionen</a></td></tr><tr><td align="right">1.14 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Eigenschaften</a></td></tr><tr><td align="right">1.15 </td><td><a href="beginner-prim-ops.html" class="tocviewlink" data-pltdoc="x">Primitive Operationen</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._for-all%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">for-<wbr></wbr>all</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">expect</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect-within%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">expect-<wbr></wbr>within</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect-member-of%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">expect-<wbr></wbr>member-<wbr></wbr>of</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect-range%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">expect-<wbr></wbr>range</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._~3d~3d~3e%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">==></span></span></a></td></tr></table></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, "6.7", "../");" 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("6.7");">top</a></span><span class="navright"> <a href="Parametrische_Record-Typ-Definitionen.html" title="backward to "1.13 Parametrische Record-Typ-Definitionen"" data-pltdoc="x">← prev</a> <a href="DMdA-beginner.html" title="up to "1 Die Macht der Abstraktion - Anfänger"" data-pltdoc="x">up</a> <a href="beginner-prim-ops.html" title="forward to "1.15 Primitive Operationen"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "deinprogramm/scribblings/deinprogramm.scrbl")" x-source-pkg="deinprogramm" x-part-tag=""Eigenschaften"">1.14<tt> </tt><a name="(part._.Eigenschaften)"></a>Eigenschaften</h4><p>Eine <a name="(tech._eigenschaft)"></a><span style="font-style: italic">Eigenschaft</span> definiert eine Aussage über einen
Scheme-Ausdruck, die experimentell überprüft werden kann. Der
einfachste Fall einer Eigenschaft ist ein boolescher Ausdruck. Die
folgende Eigenschaft gilt immer:</p><blockquote class="SCodeFlow"><p><span class="RktPn">(</span><span class="RktSym"><a href="beginner-prim-ops.html#%28def._%28%28lib._deinprogramm%2F.D.Md.A-beginner..rkt%29._~3d%29%29" class="RktValLink" data-pltdoc="x">=</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></p></blockquote><p>Es ist auch möglich, in einer Eigenschaft Variablen zu verwenden, für
die verschiedene Werte eingesetzt werden. Dafür müssen die Variablen
gebunden und <a name="(tech._quantifiziert)"></a><span style="font-style: italic">quantifiziert</span> werden, d.h. es muß festgelegt
werden, welche Signatur die Werte der Variable erfüllen sollen.
Eigenschaften mit Variablen werden mit der <span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._for-all%29%29" class="RktStxLink" data-pltdoc="x">for-all</a></span>-Form erzeugt:</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._deinprogramm/.D.Md.A..rkt)._for-all))"></a><span title="Provided from: deinprogramm/DMdA-beginner | Package: deinprogramm"><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._for-all%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">for-all</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">sig</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Dies bindet die Variablen <span class="RktVar">id</span> in der Eigenschaft
<span class="RktVar">expr</span>. Zu jeder Variable gehört eine Signatur
<span class="RktVar">sig</span>, der von den Werten der Variable erfüllt werden
muß.</div></p><p>Beispiel:</p><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._for-all%29%29" class="RktStxLink" data-pltdoc="x">for-all</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktSym"><a href="Signaturen.html#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._integer%29%29" class="RktStxLink" data-pltdoc="x">integer</a></span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="beginner-prim-ops.html#%28def._%28%28lib._deinprogramm%2F.D.Md.A-beginner..rkt%29._~3d%29%29" class="RktValLink" data-pltdoc="x">=</a></span><span class="hspace"> </span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="beginner-prim-ops.html#%28def._%28%28lib._deinprogramm%2F.D.Md.A-beginner..rkt%29._%2F%29%29" class="RktValLink" data-pltdoc="x">/</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="beginner-prim-ops.html#%28def._%28%28lib._deinprogramm%2F.D.Md.A-beginner..rkt%29._%2A%29%29" class="RktValLink" data-pltdoc="x">*</a></span><span class="hspace"> </span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._deinprogramm/.D.Md.A..rkt)._expect))"></a><span title="Provided from: deinprogramm/DMdA-beginner | Package: deinprogramm"><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">expect</a></span></span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Ein <span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect%29%29" class="RktStxLink" data-pltdoc="x">expect</a></span>-Ausdruck ergibt eine Eigenschaft, die dann gilt,
wenn die Werte von <span class="RktVar">expr</span> und <span class="RktVar">expr</span> gleich sind, im
gleichen Sinne wie bei <span class="RktSym"><a href="Testf_lle.html#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._check-expect%29%29" class="RktStxLink" data-pltdoc="x">check-expect</a></span>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._deinprogramm/.D.Md.A..rkt)._expect-within))"></a><span title="Provided from: deinprogramm/DMdA-beginner | Package: deinprogramm"><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect-within%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">expect-within</a></span></span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Wie <span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect%29%29" class="RktStxLink" data-pltdoc="x">expect</a></span>, aber entsprechend <span class="RktSym"><a href="Testf_lle.html#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._check-within%29%29" class="RktStxLink" data-pltdoc="x">check-within</a></span> mit einem
weiteren Ausdruck, der als Wert eine Zahl <span class="RktVar">delta</span> hat. Die
resultierende Eigenschaft gilt, wenn jede Zahl im Resultat des ersten
<span class="RktVar">expr</span> maximal um <span class="RktVar">delta</span> von der entsprechenden Zahl
im zweiten <span class="RktVar">expr</span> abweicht.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._deinprogramm/.D.Md.A..rkt)._expect-member-of))"></a><span title="Provided from: deinprogramm/DMdA-beginner | Package: deinprogramm"><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect-member-of%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">expect-member-of</a></span></span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Wie <span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect%29%29" class="RktStxLink" data-pltdoc="x">expect</a></span>, aber entsprechend <span class="RktSym"><a href="Testf_lle.html#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._check-member-of%29%29" class="RktStxLink" data-pltdoc="x">check-member-of</a></span> mit
weiteren Ausdrücken, die mit dem ersten verglichen werden. Die
resultierende Eigenschaft gilt, wenn das erste Argument gleich
einem der anderen Argumente ist.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._deinprogramm/.D.Md.A..rkt)._expect-range))"></a><span title="Provided from: deinprogramm/DMdA-beginner | Package: deinprogramm"><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect-range%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">expect-range</a></span></span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Wie <span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._expect%29%29" class="RktStxLink" data-pltdoc="x">expect</a></span>, aber entsprechend <span class="RktSym"><a href="Testf_lle.html#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._check-range%29%29" class="RktStxLink" data-pltdoc="x">check-range</a></span>: Die
Argumente müssen Zahlen sein. Die Eigenschaft gilt, wenn die erste Zahl
zwischen der zweiten und dritten Zahl liegt (inklusive).</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._deinprogramm/.D.Md.A..rkt)._~3d~3d~3e))"></a><span title="Provided from: deinprogramm/DMdA-beginner | Package: deinprogramm"><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._~3d~3d~3e%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">==></a></span></span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Der erste Operand ist ein boolescher Ausdruck, der zweite Operand eine
Eigenschaft: <span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._~3d~3d~3e%29%29" class="RktStxLink" data-pltdoc="x">==></a></span><span class="stt"> </span><span class="RktSym">c</span><span class="stt"> </span><span class="RktSym">p</span><span class="RktPn">)</span> legt fest, daß die Eigenschaft
<span class="RktSym">p</span> nur erfüllt sein muß, wenn <span class="RktSym">c</span> (die
<span style="font-style: italic">Bedingung</span>) <span class="RktVal">#t</span> ergibt, also erfüllt ist.</div></p><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._for-all%29%29" class="RktStxLink" data-pltdoc="x">for-all</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktSym"><a href="Signaturen.html#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._integer%29%29" class="RktStxLink" data-pltdoc="x">integer</a></span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._~3d~3d~3e%29%29" class="RktStxLink" data-pltdoc="x">==></a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="beginner-prim-ops.html#%28def._%28%28lib._deinprogramm%2F.D.Md.A-beginner..rkt%29._even~3f%29%29" class="RktValLink" data-pltdoc="x">even?</a></span><span class="hspace"> </span><span class="RktSym">x</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="beginner-prim-ops.html#%28def._%28%28lib._deinprogramm%2F.D.Md.A-beginner..rkt%29._~3d%29%29" class="RktValLink" data-pltdoc="x">=</a></span><span class="hspace"> </span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="beginner-prim-ops.html#%28def._%28%28lib._deinprogramm%2F.D.Md.A-beginner..rkt%29._%2A%29%29" class="RktValLink" data-pltdoc="x">*</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="beginner-prim-ops.html#%28def._%28%28lib._deinprogramm%2F.D.Md.A-beginner..rkt%29._%2F%29%29" class="RktValLink" data-pltdoc="x">/</a></span><span class="hspace"> </span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote><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, "6.7", "../");" 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("6.7");">top</a></span><span class="navright"> <a href="Parametrische_Record-Typ-Definitionen.html" title="backward to "1.13 Parametrische Record-Typ-Definitionen"" data-pltdoc="x">← prev</a> <a href="DMdA-beginner.html" title="up to "1 Die Macht der Abstraktion - Anfänger"" data-pltdoc="x">up</a> <a href="beginner-prim-ops.html" title="forward to "1.15 Primitive Operationen"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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