43 lines
1.4 KiB
HTML
43 lines
1.4 KiB
HTML
<html>
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<head>
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<Object type="application/x-oleobject" classid="clsid:1e2a7bd0-dab9-11d0-b93a-00c04fc99f9e">
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<param name="Keyword" value="repeat">
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<param name="Keyword" value="until">
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</OBJECT>
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<meta http-equiv="Content-Type" content="text/html; charset=windows-1251">
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<title></title>
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<link rel="StyleSheet" href="../../default.css">
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</head>
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<body>
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<H1>Îïåðàòîð öèêëà repeat</H1>
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<p><strong>Ñòàðîå</strong></p>
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Îïåðàòîð öèêëà <b><code>repeat</code></b> èìååò ñëåäóþùóþ ôîðìó:<blockquote>
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<p><code><b>repeat<br>
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</b> </code><code class="codeit">îïåðàòîðû<br>
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</code><b><code>until</code></b> <code class="codeit">óñëîâèå</code></p>
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</blockquote>
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<p> îòëè÷èå îò öèêëà <code><b>while</b></code>,
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óñëîâèå âû÷èñëÿåòñÿ ïîñëå î÷åðåäíîé èòåðàöèè öèêëà, è åñëè îíî èñòèííî, òî ïðîèñõîäèò âûõîä èç öèêëà.
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Òàêèì îáðàçîì, îïåðàòîðû, îáðàçóþùèå òåëî öèêëà îïåðàòîðà <b><code>repeat</code></b>,
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âûïîëíÿþòñÿ ïî êðàéíåé ìåðå îäèí ðàç.</p>
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<p>Îáû÷íî îïåðàòîð repeat èñïîëüçóþò â ñèòóàöèÿõ, ãäå
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óñëîâèå íåëüçÿ ïðîâåðèòü, íå âûïîëíèâ òåëî öèêëà. Íàïðèìåð:</p>
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<blockquote>
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<p><code><b>repeat</b><br>
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read(x);<br>
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<b>until</b> x=0;</code></p>
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</blockquote>
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<p>Åñëè <i>óñëîâèå</i> âñåãäà îêàçûâàåòñÿ ëîæíûì, òî ìîæåò ïðîèçîéòè
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<i>çàöèêëèâàíèå</i>: </p>
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<blockquote>
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<p><code><b>repeat</b><b><br>
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</b> write(1);<br>
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<b>until</b> 2=1;</code></p>
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</blockquote>
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<p> </p>
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</body>
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</html>
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