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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 class='vspace'></p><h2>#include</h2>
<p><strong>#include</strong> is used to include outside libraries in your sketch. This gives the programmer access to a large group of standard C libraries (groups of pre-made functions), and also libraries written especially for Arduino.
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<p class='vspace'></p><p>The main reference page for AVR C libraries (AVR is a reference to the Atmel chips on which the Arduino is based) is <a class='urllink' href='http://www.nongnu.org/avr-libc/user-manual/modules.html' rel='nofollow'>here.</a>
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<p class='vspace'></p><p>Note that <strong>#include</strong>, similar to <strong>#define</strong>, has no semicolon terminator, and the compiler will yield cryptic error messages if you add one.
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<p class='vspace'></p><h4>Example</h4>
<p>This example includes a library that is used to put data into the program space <em>flash</em> instead of <em>ram</em>. This saves the ram space for dynamic memory needs and makes large lookup tables more practical.
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<p class='vspace'></p><pre>
#include <avr/pgmspace.h>
prog_uint16_t myConstants[] PROGMEM = {0, 21140, 702 , 9128, 0, 25764, 8456,
0,0,0,0,0,0,0,0,29810,8968,29762,29762,4500};
</pre><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://arduino.cc/forum/index.php/board,23.0.html' rel='nofollow'>Forum</a>.</em>
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<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
<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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