65 lines
2.4 KiB
HTML
65 lines
2.4 KiB
HTML
<html>
|
|
|
|
<head>
|
|
<object type="application/x-oleobject" classid="clsid:1e2a7bd0-dab9-11d0-b93a-00c04fc99f9e">
|
|
<param name="Keyword" value="Îïåðàòîð ïðèñâàèâàíèÿ">
|
|
</object>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=windows-1251">
|
|
<title></title>
|
|
<link rel="StyleSheet" href="../../default.css">
|
|
</head>
|
|
|
|
<body>
|
|
<H1>Îïåðàòîð ïðèñâàèâàíèÿ</H1>
|
|
Îïåðàòîð ïðèñâàèâàíèÿ èìååò âèä:
|
|
<blockquote>
|
|
<p><code class="codeit">ïåðåìåííàÿ</code> <code>:=</code> <code class="codeit">âûðàæåíèå</code></p>
|
|
</blockquote>
|
|
<p> êà÷åñòâå ïåðåìåííîé ìîæåò áûòü ïðîñòàÿ ïåðåìåííàÿ, ðàçûìåíîâàííûé
|
|
óêàçàòåëü, ïåðåìåííàÿ ñ èíäåêñàìè èëè êîìïîíåíò ïåðåìåííîé òèïà çàïèñü.
|
|
Ñèìâîë <code>:=</code> íàçûâàåòñÿ çíà÷êîì ïðèñâàèâàíèÿ. Âûðàæåíèå äîëæíî áûòü <a href="../Types/typecompatibility.html">ñîâìåñòèìî ïî
|
|
ïðèñâàèâàíèþ</a> ñ ïåðåìåííîé.</p>
|
|
<p>Îïåðàòîð ïðèñâàèâàíèÿ çàìåíÿåò òåêóùåå çíà÷åíèå ïåðåìåííîé çíà÷åíèåì
|
|
âûðàæåíèÿ.</p>
|
|
<p>Íàïðèìåð:</p>
|
|
<blockquote>
|
|
<p><code>i := i + 1; // óâåëè÷èâàåò çíà÷åíèå ïåðåìåííîé i íà 1</code></p>
|
|
</blockquote>
|
|
<p>Â <b>PascalABC.NET</b> îïðåäåëåíû òàêæå îïåðàòîðû
|
|
ïðèñâàèâàíèÿ ñî çíà÷êàìè
|
|
<code>+=</code>, <code>-=</code>,
|
|
<code>*=</code>, <code>/=</code>. Äëÿ
|
|
÷èñëîâûõ òèïîâ äåéñòâèå äàííûõ îïåðàòîðîâ îïèñàíî
|
|
<a href="../Operations_Expressions/arithmop.html">çäåñü</a>. Êðîìå òîãî,
|
|
èñïîëüçîâàíèå îïåðàòîðîâ <code>+=</code> è <code>*=</code> äëÿ ñòðîê îïèñàíî
|
|
<a href="../Operations_Expressions/stringop.html">çäåñü</a> <span lang="ru">è îïåðàòîðîâ </span><code>
|
|
+=</code><span lang="ru">, </span><code>-=</code><span lang="ru"> è </span>
|
|
<code>*=</code><span lang="ru"> äëÿ ìíîæåñòâ -
|
|
<a href="../Operations_Expressions/setop.html">çäåñü</a>. </span>Èõ äåéñòâèå äëÿ
|
|
ïðîöåäóðíûõ ïåðåìåííûõ îïèñàíî <a href="plusequal.html">çäåñü</a>. </p>
|
|
<p>Îïåðàòîðû
|
|
<code>+=</code>, <code>-=</code>,
|
|
<code>*=</code>, <code>/=</code> èìåþò
|
|
ñëåäóþùèé ñìûñë: <code>a #= b</code> îçíà÷àåò
|
|
<code>a := a # b</code>, ãäå <code>#</code> -
|
|
çíàê îïåðàöèè
|
|
<code>+</code>, <code>-</code>,
|
|
<code>*</code>, <code>/</code>. </p>
|
|
<p>Íàïðèìåð:</p>
|
|
<blockquote>
|
|
<p><code>a += 3; // óâåëè÷èòü a íà 3<br>
|
|
b *= 2; // óâåëè÷èòü b â 2 ðàçà</code></p>
|
|
</blockquote>
|
|
<p>Îïåðòîð <code>/=</code> íåïðèìåíèì,
|
|
åñëè âûðàæåíèå ñëåâà - öåëîå.</p>
|
|
|
|
<p>Îïåðàòîðû
|
|
<code>+=</code>, <code>-=</code>,
|
|
<code>*=</code>, <code>/=</code> ìîãóò òàêæå èñïîëüçîâàòüñÿ ñî
|
|
<a href="../Classes/properties.html">ñâîéñòâàìè
|
|
êëàññîâ</a> ñîîòâåòñòâóþùèõ òèïîâ â ëåâîé ÷àñòè.</p>
|
|
|
|
</body>
|
|
|
|
</html>
|