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111 lines
4.3 KiB
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<title>Arduino Reference - While </title>
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<div class="title"><a href='http://arduino.cc/en'>Arduino</a></div>
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<p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</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>while loops</h2>
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<h4>Description</h4>
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<p><strong>while</strong> loops will loop continuously, and infinitely, until the expression inside the parenthesis, () becomes false. Something must change the tested variable, or the <strong>while</strong> loop will never exit. This could be in your code, such as an incremented variable, or an external condition, such as testing a sensor.
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</p>
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<p class='vspace'></p><h4>Syntax</h4>
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<pre>while(expression){
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// statement(s)
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}
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</pre>
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<p class='vspace'></p><h4>Parameters</h4>
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<p>expression - a (boolean) C statement that evaluates to true or false
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</p>
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<p class='vspace'></p><h4>Example</h4>
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<pre>
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var = 0;
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while(var < 200){
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// do something repetitive 200 times
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var++;
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}
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</pre><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://arduino.cc/forum/index.php/board,23.0.html' 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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