104 lines
4.1 KiB
HTML
104 lines
4.1 KiB
HTML
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<!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 - Return </title>
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<link rel='stylesheet' href='arduino.css' type='text/css' />
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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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</div>
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<a class="urllink" href="http://www.arduino.cc/blog/" rel="nofollow">Blog »</a> |
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<a class="urllink" href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl" rel="nofollow">Forum »</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>return</h2>
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<p>Terminate a function and return a value from a function to the calling function, if desired.
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</p>
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<p class='vspace'></p><h4>Syntax:</h4>
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<p>return;
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</p>
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<p class='vspace'></p><p>return value; // both forms are valid
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</p>
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<p class='vspace'></p><h4>Parameters</h4>
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<p>value: any variable or constant type
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</p>
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<p class='vspace'></p><h4>Examples:</h4>
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<p>A function to compare a sensor input to a threshold
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</p><pre> int checkSensor(){
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if (analogRead(0) > 400) {
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return 1;
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else{
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return 0;
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}
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}
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</pre>
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<p class='vspace'></p><p>The return keyword is handy to test a section of code without having to "comment out" large sections of possibly buggy code.
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</p>
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<p class='vspace'></p><pre>void loop(){
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// brilliant code idea to test here
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return;
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// the rest of a dysfunctional sketch here
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// this code will never be executed
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}
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</pre>
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<p class='vspace'></p><h4>See also</h4>
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<p><a class='wikilink' href='Comments.html'>comments</a>
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</p>
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<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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</p>
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