<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Arduino Reference - StringObject </title> <link rel="shortcut icon" type="image/x-icon" href="http://arduino.cc/en/favicon.png"> <link rel='stylesheet' href='arduinoWideRender.css' type='text/css' /> <!--HeaderText--><style type='text/css'><!-- ul, ol, pre, dl, p { margin-top:0px; margin-bottom:0px; } code { white-space: nowrap; } .vspace { margin-top:1.33em; } .indent { margin-left:40px; } .outdent { margin-left:40px; text-indent:-40px; } a.createlinktext { text-decoration:none; border-bottom:1px dotted gray; } a.createlink { text-decoration:none; position:relative; top:-0.5em; font-weight:bold; font-size:smaller; border-bottom:none; } img { border:0px; } .editconflict { color:green; font-style:italic; margin-top:1.33em; margin-bottom:1.33em; } table.markup { border: 2px dotted #ccf; width:90%; } td.markup1, td.markup2 { padding-left:10px; padding-right:10px; } td.markup1 { border-bottom: 1px solid #ccf; } div.faq { margin-left:2em; } div.faq p.question { margin: 1em 0 0.75em -2em; font-weight:bold; } div.faq hr { margin-left: -2em; } .frame { border:1px solid #cccccc; padding:4px; background-color:#f9f9f9; } .lfloat { float:left; margin-right:0.5em; } .rfloat { float:right; margin-left:0.5em; } a.varlink { text-decoration:none; } --></style> <meta name='robots' content='index,follow' /> <meta name="verify-v1" content="TtxFIEJAB6zdJ509wLxjnapQzKAMNm9u0Wj4ho6wxIY=" /> </head> <body> <div id="page"> <!--PageHeaderFmt--> <div id="pageheader"> <div class="title"><a href='http://arduino.cc/en'>Arduino</a></div> </div> <!--/PageHeaderFmt--> <!--PageLeftFmt--> <div id="pagenav"> <div id="navbar"> <p><a class='wikilink' href='http://arduino.cc/en/Main/Buy'>Buy</a> <a class='wikilink' href='http://arduino.cc/en/Main/Software'>Download</a> <a class='wikilink' href='Guide_index.html'>Getting Started</a> <a class='wikilink' href='http://arduino.cc/en/Tutorial/HomePage'>Learning</a> <a class='wikilink' href='index.html'>Reference</a> <a class='wikilink' href='http://arduino.cc/en/Main/Hardware'>Hardware</a> <a class='wikilink' href='FAQ.html'>FAQ</a> </p> <p class='vspace'></p> </div> </div> <!--/PageLeftFmt--> <div id="pagetext"> <!--PageText--> <div id='wikitext'> <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> </p> <p class='vspace'></p><h2>String</h2> <h4>Description</h4> <p>The String class, part of the core as of version 0019, allows you to use and manipulate strings of text in more complex ways than <a class='wikilink' href='String.html'>character arrays</a> do. You can concatenate Strings, append to them, search for and replace substrings, and more. It takes more memory than a simple character array, but it is also more useful. </p> <p class='vspace'></p><p>For reference, character arrays are referred to as strings with a small s, and instances of the String class are referred to as Strings with a capital S. Note that constant strings, specified in "double quotes" are treated as char arrays, not instances of the String class. </p> <p class='vspace'></p><h4>Functions</h4> <ul><li><a class='wikilink' href='StringConstructor.html'>String</a>() </li><li><a class='wikilink' href='StringCharAt.html'>charAt</a>() </li><li><a class='wikilink' href='StringCompareTo.html'>compareTo</a>() </li><li><a class='wikilink' href='StringConcat.html'>concat</a>() </li><li><a class='wikilink' href='StringEndsWith.html'>endsWith</a>() </li><li><a class='wikilink' href='StringEquals.html'>equals</a>() </li><li><a class='wikilink' href='StringEqualsIgnoreCase.html'>equalsIgnoreCase</a>() </li><li><a class='wikilink' href='StringGetBytes.html'>getBytes</a>() </li><li><a class='wikilink' href='StringIndexOf.html'>indexOf</a>() </li><li><a class='wikilink' href='StringLastIndexOf.html'>lastIndexOf</a>() </li><li><a class='wikilink' href='StringLength.html'>length</a>() </li><li><a class='wikilink' href='StringReplace.html'>replace</a>() </li><li><a class='wikilink' href='StringSetCharAt.html'>setCharAt</a>() </li><li><a class='wikilink' href='StringStartsWith.html'>startsWith</a>() </li><li><a class='wikilink' href='StringSubstring.html'>substring</a>() </li><li><a class='wikilink' href='StringToCharArray.html'>toCharArray</a>() </li><li><a class='wikilink' href='StringToLowerCase.html'>toLowerCase</a>() </li><li><a class='wikilink' href='StringToUpperCase.html'>toUpperCase</a>() </li><li><a class='wikilink' href='StringTrim.html'>trim</a>() </li></ul><p class='vspace'></p><h4>Operators</h4> <ul><li><a class='wikilink' href='StringBrackets.html'>[] (element access)</a> </li><li><a class='wikilink' href='StringPlus.html'>+ (concatenation)</a> </li><li><a class='wikilink' href='StringComparison.html'>== (comparison)</a> </li></ul><p class='vspace'></p><h4>Examples</h4> <ul><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringConstructors'>StringConstructors</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringAdditionOperator'>StringAdditionOperator</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringIndexOf'>StringIndexOf</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringAppendOperator'>StringAppendOperator</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringLengthTrim'>StringLengthTrim</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringCaseChanges'>StringCaseChanges</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringReplace'>StringReplace</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringCharacters'>StringCharacters</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringStartsWithEndsWith'>StringStartsWithEndsWith</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringComparisonOperators'>StringComparisonOperators</a> </li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/StringSubstring'>StringSubstring</a> </li></ul><p class='vspace'></p><h4>See Also</h4> <ul><li><a class='wikilink' href='String.html'>string</a>: character arrays </li><li><a class='urllink' href='http://arduino.cc/en/Reference/VariableDeclaration' rel='nofollow'>Variable Declaration</a> </li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a> </p> <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> </p> <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. </p> </div> </div> <!--PageFooterFmt--> <div id="pagefooter"> ©Arduino | <a href='#'>Edit Page</a> | <a href='#'>Page History</a> | <a href='#' target='_blank'>Printable View</a> | <a href='http://arduino.cc/en/Site/AllRecentChanges'>All Recent Site Changes</a> </div> <!--/PageFooterFmt--> </div> </body> </html>