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111 lines
4.3 KiB
HTML
111 lines
4.3 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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<title>Arduino - Modulo </title>
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<link rel='stylesheet' href='arduino.css' type='text/css' />
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<meta name="verify-v1" content="TtxFIEJAB6zdJ509wLxjnapQzKAMNm9u0Wj4ho6wxIY=" />
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<body>
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<div id="page">
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<div class="title"><a href="http://www.arduino.cc"/>Arduino</a></div>
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<p><a class='wikilink' href='http://arduino.cc/en/Main/Buy'>Buy</a>
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<a class="urllink" href="http://www.arduino.cc/blog/" rel="nofollow">Blog »</a> |
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<p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</a> (<a class='wikilink' href='Extended.html'>extended</a>) | <a class='wikilink' href='Libraries.html'>Libraries</a> | <a class='wikilink' href='Comparison.html'>Comparison</a> | <a class='wikilink' href='Changes.html'>Changes</a>
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</p>
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<p class='vspace'></p><h2>% (modulo)</h2>
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<h4>Description</h4>
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<p>Calculates the remainder when one integer is divided by another. It is useful for keeping a variable within a particular range (e.g. the size of an array).
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</p>
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<p class='vspace'></p><h4>Syntax</h4>
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<p>result = dividend % divisor
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</p>
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<p class='vspace'></p><h4>Parameters</h4>
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<p>dividend: the number to be divided
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</p>
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<p class='vspace'></p><p>divisor: the number to divide by
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</p>
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<p class='vspace'></p><h4>Returns</h4>
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<p>the remainder
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</p>
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<p class='vspace'></p><h4>Examples</h4>
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<pre>x = 7 % 5; // x now contains 2
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x = 9 % 5; // x now contains 4
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x = 5 % 5; // x now contains 0
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x = 4 % 5; // x now contains 4
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</pre>
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<p class='vspace'></p><h4>Example Code</h4>
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<pre>
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/* update one value in an array each time through a loop */
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int values[10];
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int i = 0;
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void setup() {}
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void loop()
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{
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values[i] = analogRead(0);
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i = (i + 1) % 10; // modulo operator rolls over variable
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}
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</pre>
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<p class='vspace'></p><h4>Tip</h4>
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<p>The modulo operator does not work on floats.
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</p>
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<p class='vspace'></p><h4>See also</h4>
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<ul><li><a class='wikilink' href='Arithmetic.html'>division</a>
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</li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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</p>
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<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?board=swbugs' rel='nofollow'>Forum</a>.</em>
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</p>
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<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
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<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>. Code samples in the reference are released into the public domain.
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