93 lines
4.4 KiB
HTML
93 lines
4.4 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 - Goto </title>
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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>goto</h2>
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<p>Transfers program flow to a labeled point in the program
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</p>
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<p class='vspace'></p><h4>Syntax</h4>
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<p>label:
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</p>
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<p class='vspace'></p><p>goto label; // sends program flow to the label
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</p>
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<p class='vspace'></p><h4>Tip</h4>
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<p>The use of <em>goto</em> is discouraged in C programming, and some authors of C programming books claim that the <em>goto</em> statement is never necessary, but used judiciously, it can simplify certain programs. The reason that many programmers frown upon the use of <em>goto</em> is that with the unrestrained use of <em>goto</em> statements, it is easy to create a program with undefined program flow, which can never be debugged.
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</p>
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<p class='vspace'></p><p>With that said, there are instances where a goto statement can come in handy, and simplify coding. One of these situations is to break out of deeply nested <em>for</em> loops, or <em>if</em> logic blocks, on a certain condition.
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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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for(byte r = 0; r < 255; r++){
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for(byte g = 255; g > -1; g--){
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for(byte b = 0; b < 255; b++){
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if (analogRead(0) > 250){ goto bailout;}
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// more statements ...
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}
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}
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}
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bailout:
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</pre>
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<p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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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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