52 lines
2.3 KiB
HTML
52 lines
2.3 KiB
HTML
<html><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="Êîíêàòåíàöèÿ ñòðîê">
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<param name="Keyword" value="in">
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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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<style type="text/css">
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.auto-style2 {
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font-family: monospace;
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font-size: 10pt;
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color: #000080;
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}
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</style>
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</head>
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<body><H1>Ñòðîêîâûå îïåðàöèè</H1>
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<p>Ê <a href="../Types/string.html">ñòðîêàì</a> ïðèìåíèìû âñå <a href="relop.html">îïåðàöèè ñðàâíåíèÿ</a> <code><</code>, <code>></code>, <code><=</code>, <code>>=</code>, <code>=</code>, <code><></code>.
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Ñðàâíåíèå ñòðîê íà íåðàâåíñòâî îñóùåñòâëÿåòñÿ <strong>
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ëåêñèêîãðàôè÷åñêè</strong>: <span class="auto-style2">s1 < s2</span> åñëè äëÿ
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ïåðâîãî íåñîâïàäàþùåãî ñèìâîëà ñ íîìåðîì i <span class="auto-style2">s1[i]<s2[i]</span>
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èëè âñå ñèìâîëû ñòðîê ñîâïàäàþò, íî <span class="auto-style2">s1</span> êîðî÷å
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<span class="auto-style2">s2</span>.
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</p>
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<p>Êðîìå ýòîãî, ê ñòðîêàì è ñèìâîëàì ïðèìåíèìà îïåðàöèÿ
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êîíêàòåíàöèè (ñëèÿíèÿ) <code>+</code>, åå ðåçóëüòàò èìååò ñòðîêîâûé òèï.
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</p>
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<p>Íàïðèìåð, <code>'a'+'b'='ab'</code>. </p>
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<p>Ê ñòðîêàì òàêæå ïðèìåíèìà îïåðàöèÿ <code>+=</code>:
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</p>
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<blockquote>
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<p><code>s += s1; // s := s + s1;</code> </p>
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</blockquote>
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<p>Ñòðîêà ìîæåò ñêëàäûâàòüñÿ ñ ÷èñëîì, ïðè ýòîì ÷èñëî ïðåäâàðèòåëüíî
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ïðåîáðàçóåòñÿ ê ñòðîêîâîìó ïðåäñòàâëåíèþ:</p>
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<blockquote><code>s := 'Øèðèíà: '+15; // s = 'Øèðèíà: 15'<br>s :=
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20.5+''; // s = '20.5'<br>s += 1; // s = '20.51' </code>
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</blockquote>
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<p>Íàä ñòðîêàìè è öåëûìè îïðåäåëåíà îïåðàöèÿ <span class="auto-style2">*</span>:
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<span class="auto-style2">s*n</span> è <span class="auto-style2">n*s</span>
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îçíà÷àåò ñòðîêó, îáðàçîâàííóþ èç ñòðîêè <span class="auto-style2">s</span>,
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ïîâòîðåííîé n ðàç:</p>
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<blockquote><code>s := '*'*10; // s = '**********'<br>s := 5*'ab' // s = 'ababababab'<br>s := 'd'; s *= 3; // s =
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'ddd' </code></blockquote>
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<p>Íàä ñòðîêàìè îïðåäåëåíà îïåðàöèÿ <code><strong>in</strong></code> äëÿ
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ïðîâåðêè âëîæåíèÿ ïîäñòðîêè â ñòðîêó: </p>
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<blockquote><code>'bc' <strong>in</strong> 'abcde' // True <br>'c' <strong>
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in</strong> 'abd' // False</code></blockquote>
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</body></html> |