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recur.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>how to use</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="navig.css">
<link rel="stylesheet" type="text/css" href="main.css">
<script type="application/javascript">
function resizeIFrameToFitContent( iFrame ) {
iFrame.width = iFrame.contentWindow.document.body.scrollWidth;
iFrame.height = iFrame.contentWindow.document.body.scrollHeight;
}
window.addEventListener('DOMContentLoaded', function(e) {
var iFrame = document.getElementById( 'iFrame1' );
resizeIFrameToFitContent( iFrame );
// or, to resize all iframes:
var iframes = document.querySelectorAll("iframe");
for( var i = 0; i < iframes.length; i++) {
resizeIFrameToFitContent( iframes[i] );
}
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</script>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-3 left-menu">
<div class="logo"><i class="fa fa-coffee "></i>
<div>VIZ JAVA</div>
</div>
<div class="accordion">
<div class="section">
<input type="radio" name="accordion-1" id="section-1" value="toggle"/>
<label for="section-1"><span>Intro</span></label>
<div class="content">
<ul>
<li><i class="fa fa-start"></i><span><a href="howtouse.html">How to use</a></span></li>
</ul>
</div>
</div>
<div class="section">
<input type="radio" name="accordion-1" id="section-2" value="toggle"/>
<label for="section-2"> <span>Primitive and reference types</span></label>
<div class="content">
<ul>
<li><i class="fa fa-start"></i><span><a href="types.html">Types</a></span></li>
</ul>
</div>
</div>
<div class="section">
<input type="radio" name="accordion-1" id="section-3" value="toggle"/>
<label for="section-3"> <span>Array</span></label>
<div class="content">
<ul>
<li><i class="fa fa-start"></i><span><a href="arrays_1.html">Arrays_1</a></span></li>
<li><i class="fa fa-start"></i><span><a href="arrays_2.html">Arrays_2</a></span></li>
<li><i class="fa fa-start"></i><span><a href="arrays_3.html">Arrays_3</a></span></li>
<li><i class="fa fa-start"></i><span><a href="arrays.html">Advanced</a></span></li>
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<label for="section-4"> <span>Recursion</span></label>
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<ul>
<li><i class="fa fa-start"></i><span><a href="recur.html">Start</a></span></li>
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<input type="radio" name="accordion-1" id="section-5" value="toggle"/>
<label for="section-5"> <span>forloop</span></label>
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<input type="radio" name="accordion-1" id="section-6" value="toggle"/>
<label for="section-6"> <span>While Loops </span></label>
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<label for="section-7"> <span>Lab Reviews </span></label>
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<li><i class="fa fa-start"></i><span><a href="lab1.html">Lab 1</a></span></li>
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<li><i class="fa fa-start"></i><span><a href="lab3.html">Lab 3</a></span></li>
<li><i class="fa fa-start"></i><span><a href="lab4.html">Lab 4</a></span></li>
</ul>
</div>
</div>
</div>
</div>
<div class="col-md-9 right-content">
<p>Write a recursive method called countA that takes a String parameter and returns an int, which is a count of the number of times the lowercase letter 'a' occurs in a String.</p>
<iframe width="1200" height="800" frameborder="0" src="http://pythontutor.com/iframe-embed.html#code=public%20class%20testRecursion%20%7B%0A%20%20%20%20public%20static%20void%20main%28String%5B%5D%20args%29%20%7B%0A%20%20%20%20%20%20String%20str%20%3D%20%22Happy%20Hal%22%3B%0A%20%20%20%20%20%20int%20result%20%3D%20countA%28str%29%3B%0A%20%20%20%20%7D%0A%20%20%20%20public%20static%20int%20countA%28String%20s%29%20%7B%0A%20%20%20%20%20if%20%28s.length%28%29%20%3D%3D%200%29%20%7B%0A%20%20%20%20%20%20%20return%200%3B%0A%20%20%20%20%20%7D%0A%20%20%20%20%20if%20%28s.charAt%280%29%20%3D%3D%20'a'%29%20%7B%0A%20%20%20%20%20%20%20return%201%20%2B%20countA%28s.substring%281%29%29%3B%0A%20%20%20%20%20%7D%20else%20%7B%0A%20%20%20%20%20%20%20return%20countA%28s.substring%281%29%29%3B%0A%20%20%20%20%20%7D%0A%20%20%20%20%7D%0A%0A%7D&codeDivHeight=400&codeDivWidth=350&cumulative=false&curInstr=0&heapPrimitives=false&origin=opt-frontend.js&py=java&rawInputLstJSON=%5B%5D&textReferences=false"> </iframe>
<p>Great. Now that you know how to use this, let's continue to the next lesson.</p>
</div>
</div>
</div>
</body>
</html>