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110 lines
4.7 KiB
HTML
110 lines
4.7 KiB
HTML
15 years ago
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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 - SwitchCase </title>
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<div class="title"><a href="http://www.arduino.cc"/>Arduino</a></div>
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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>switch / case statements</h2>
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<p>Like <strong>if</strong> statements, <strong>switch...case</strong> controls the flow of programs by allowing programmers to specify different code that should be executed in various conditions. In particular, a switch statement compares the value of a variable to the values specified in case statements. When a case statement is found whose value matches that of the variable, the code in that case statement is run.
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</p>
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<p class='vspace'></p><p>The <strong>break</strong> keyword exits the switch statement, and is typically used at the end of each case. Without a break statement, the switch statement will continue executing the following expressions ("falling-through") until a break, or the end of the switch statement is reached.
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</p>
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<p class='vspace'></p><h3>Example</h3>
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<pre>
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switch (var) {
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case 1:
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//do something when var equals 1
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break;
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case 2:
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//do something when var equals 2
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break;
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default:
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// if nothing else matches, do the default
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// default is optional
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}
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</pre>
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<p class='vspace'></p><h3>Syntax</h3>
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<pre>
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switch (var) {
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case label:
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// statements
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break;
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case label:
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// statements
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break;
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default:
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// statements
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}
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</pre>
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<p class='vspace'></p><h3>Parameters</h3>
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<p>var: the variable whose value to compare to the various cases
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</p>
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<p class='vspace'></p><p>label: a value to compare the variable to
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</p>
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<p class='vspace'></p><h4>See also:</h4>
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<p><a class='wikilink' href='Else.html'>if...else</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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</div>
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</html>
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