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92 lines
4.8 KiB
HTML
92 lines
4.8 KiB
HTML
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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>
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<p class='vspace'></p><h2>switch / case statements</h2>
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<p>Just like <strong>if</strong> statements, <strong>switch / case</strong> statements control the flow of programs. Switch/case allows the programmer to build a list of "cases" inside a switch curly bracket. The program checks each case for a match with the test variable, and runs the code if a match is found.
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<p class='vspace'></p><p><strong>Switch / case</strong> is slightly more flexible than than an <strong>if/else</strong> structure in that the programmer can determine if the <strong>switch</strong> structure should continue checking for matches in the case list, after finding a match. If the <strong>break</strong> statement is not found after running the code for a matched case, the program will continue to check for more matches among the other cases. If a <strong>break</strong> statement is encountered, case exits the structure, in the same manner as the <strong>if/else if</strong> construction.
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</p>
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<p class='vspace'></p><h3>Parameters</h3>
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<ul><li>var - variable you wish to match with case statements
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</li><li>default - if no other conditions are met, default will run
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</li><li>break - without break, the switch statement will continue checking through the case statements for any other possible matches. If one is found, it will run that as well, which may not be your intent. Break tells the switch statement to stop looking for matches, and exit the switch statement.
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</li></ul><p class='vspace'></p><h3>Example</h3>
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<dl><dd><pre>
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switch (var) {
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case 1:
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//do something when var == 1
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break;
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// break is optional
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case 2:
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//do something when var == 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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</dd></dl><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 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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