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170 lines
7.9 KiB
HTML
170 lines
7.9 KiB
HTML
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<a class="urllink" href="http://www.arduino.cc/blog/" rel="nofollow">Blog »</a><a class="urllink" href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl" rel="nofollow">Forum »</a><a class="urllink" href="http://www.arduino.cc/playground/" rel="nofollow">Playground »</a>
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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>= assignment operator (single equal sign)</h2>
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<p>Stores the value to the right of the equal sign in the variable to the left of the equal sign.
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</p>
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<p class='vspace'></p><p>The single equal sign in the C programming language is called the assignment operator. It has a different meaning than in algebra class where it indicated an equation or equality. The assignment operator tells the microcontroller to evaluate whatever value or expression is on the right side of the equal sign, and store it in the variable to the left of the equal sign.
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</p>
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<p class='vspace'></p><h4>Example</h4>
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<pre> int sensVal; // declare an integer variable named sensVal
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senVal = analogRead(0); // store the (digitized) input voltage at analog pin 0 in <span class='wikiword'>SensVal</span>
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</pre>
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<p class='vspace'></p><h4>Programming Tips</h4>
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<p>The variable on the left side of the assignment operator ( = sign ) needs to be able to hold the value stored in it. If it is not large enough to hold a value, the value stored in the variable will be incorrect.
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</p>
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<p class='vspace'></p><p>Don't confuse the assignment operator [ = ] (single equal sign) with the comparison operator [ == ] (double equal signs), which evaluates whether two expressions are equal.
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</p>
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<p class='vspace'></p><h4>See Also</h4>
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<ul><li><a class='wikilink' href='If.html'>if (comparison operators)</a>
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</li><li><a class='wikilink' href='Char.html'>char</a>
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</li><li><a class='wikilink' href='Int.html'>int</a>
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</li><li><a class='wikilink' href='Long.html'>long</a>
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</li></ul><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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