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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>1.9 and</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="" class="tocviewselflink" 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="Eigenschaften.html" class="tocviewlink" 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._and%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">and</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, "6.1", "../");" 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="if.html" title="backward to "1.8 if"" 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="or.html" title="forward to "1.10 or"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "deinprogramm/scribblings/deinprogramm.scrbl")" x-part-tag=""and"">1.9<tt> </tt><a name="(part._and)"></a><span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._and%29%29" class="RktStxLink" data-pltdoc="x">and</a></span></h4><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)._and))"></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._and%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">and</a></span></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">Bei der Auswertung eines <span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._and%29%29" class="RktStxLink" data-pltdoc="x">and</a></span>-Ausdrucks werden nacheinander die
Operanden (die boolesche Werte ergeben müssen) ausgewertet. Ergibt
einer <span class="RktVal">#f</span>, ergibt auch der and-Ausdruck <span class="RktVal">#f</span>; wenn alle
Operanden <span class="RktVal">#t</span> ergeben, ergibt auch der <span class="RktSym"><a href="#%28form._%28%28lib._deinprogramm%2F.D.Md.A..rkt%29._and%29%29" class="RktStxLink" data-pltdoc="x">and</a></span>-Ausdruck
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