2020-01-16 04:07:02 +00:00
|
|
|
<!DOCTYPE html>
|
|
|
|
|
<html>
|
|
|
|
|
<head>
|
|
|
|
|
<meta charset="utf-8" />
|
2022-02-15 06:14:58 +00:00
|
|
|
<meta name="author" content="Brandon Rozek">
|
2020-01-16 04:07:02 +00:00
|
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
|
|
|
<meta name="robots" content="noindex" />
|
|
|
|
|
<title>Brandon Rozek</title>
|
|
|
|
|
<link rel="stylesheet" href="themes/bitsandpieces/styles/main.css" type="text/css" />
|
|
|
|
|
<link rel="stylesheet" href="themes/bitsandpieces/styles/highlightjs-github.css" type="text/css" />
|
|
|
|
|
</head>
|
|
|
|
|
<body>
|
|
|
|
|
|
|
|
|
|
<aside class="main-nav">
|
|
|
|
|
<nav>
|
|
|
|
|
<ul>
|
|
|
|
|
<li class="menuitem ">
|
|
|
|
|
<a href="index.html%3Findex.html" data-shortcut="">
|
|
|
|
|
Home
|
|
|
|
|
</a>
|
|
|
|
|
</li>
|
|
|
|
|
<li class="menuitem ">
|
|
|
|
|
<a href="index.html%3Fcourses.html" data-shortcut="">
|
|
|
|
|
Courses
|
|
|
|
|
</a>
|
|
|
|
|
</li>
|
|
|
|
|
<li class="menuitem ">
|
|
|
|
|
<a href="index.html%3Flabaide.html" data-shortcut="">
|
|
|
|
|
Lab Aide
|
|
|
|
|
</a>
|
|
|
|
|
</li>
|
|
|
|
|
<li class="menuitem ">
|
|
|
|
|
<a href="index.html%3Fpresentations.html" data-shortcut="">
|
|
|
|
|
Presentations
|
|
|
|
|
</a>
|
|
|
|
|
</li>
|
|
|
|
|
<li class="menuitem ">
|
|
|
|
|
<a href="index.html%3Fresearch.html" data-shortcut="">
|
|
|
|
|
Research
|
|
|
|
|
</a>
|
|
|
|
|
</li>
|
|
|
|
|
<li class="menuitem ">
|
|
|
|
|
<a href="index.html%3Ftranscript.html" data-shortcut="">
|
|
|
|
|
Transcript
|
|
|
|
|
</a>
|
|
|
|
|
</li>
|
|
|
|
|
</ul>
|
|
|
|
|
</nav>
|
|
|
|
|
</aside>
|
|
|
|
|
<main class="main-content">
|
|
|
|
|
<article class="article">
|
|
|
|
|
<h1>Lecture for February 13</h1>
|
|
|
|
|
<h2>Loops</h2>
|
|
|
|
|
<h3>Why Loops?</h3>
|
|
|
|
|
<p>While some check is true, repeat the work.</p>
|
|
|
|
|
<p>While the cookies aren't baked, keep baking</p>
|
|
|
|
|
<h3>Loop Building Process</h3>
|
|
|
|
|
<ol>
|
|
|
|
|
<li>Identify one test that must be true when the loop is finished</li>
|
|
|
|
|
<li>Use the <strong>opposite</strong> form of the test</li>
|
|
|
|
|
<li>Within loop, make <em>progress</em> towards completion of the goal.</li>
|
|
|
|
|
</ol>
|
|
|
|
|
<h3>While syntax</h3>
|
|
|
|
|
<pre><code class="language-java">while (expression) {
|
|
|
|
|
// Loop body executes if expression is true
|
|
|
|
|
}
|
|
|
|
|
// Statements execute after expression is false</code></pre>
|
|
|
|
|
<h3>Getting Input (Songs in a Playlist Psuedocode)</h3>
|
|
|
|
|
<pre><code class="language-java">// Ask user about first song
|
|
|
|
|
while (user says play next song) {
|
|
|
|
|
// play next song
|
|
|
|
|
// ask user about next song
|
|
|
|
|
}</code></pre>
|
|
|
|
|
<h3>Nested Loops</h3>
|
|
|
|
|
<p>You can have loops inside loops</p>
|
|
|
|
|
<pre><code class="language-java">int outer = 1;
|
|
|
|
|
while (outer < 4) {
|
|
|
|
|
int inner = 1;
|
|
|
|
|
while (inner < 4) {
|
|
|
|
|
System.out.println(outer + ":" + inner);
|
|
|
|
|
inner++;
|
|
|
|
|
}
|
|
|
|
|
outer++;
|
|
|
|
|
}</code></pre>
|
|
|
|
|
<p>This code does the following</p>
|
|
|
|
|
<pre><code class="language-reStructuredText">1:1
|
|
|
|
|
1:2
|
|
|
|
|
1:3
|
|
|
|
|
2:1
|
|
|
|
|
2:2
|
|
|
|
|
2:3
|
|
|
|
|
3:1
|
|
|
|
|
3:2
|
|
|
|
|
3:3</code></pre>
|
|
|
|
|
<h3>Break Down the Problem</h3>
|
|
|
|
|
<p>Never write the entire program at once! This makes it incredibly hard to debug. Instead break it into small parts.</p>
|
|
|
|
|
<p>Write one part -> debug until it works</p>
|
|
|
|
|
<p>Write second part -> debug until it works</p>
|
|
|
|
|
<p>This way you know which part of your code failed, instead of having everything fail.</p>
|
|
|
|
|
</article>
|
|
|
|
|
</main>
|
|
|
|
|
|
|
|
|
|
<script src="themes/bitsandpieces/scripts/highlight.js"></script>
|
|
|
|
|
<script src="themes/bitsandpieces/scripts/mousetrap.min.js"></script>
|
|
|
|
|
<script type="text/x-mathjax-config">
|
|
|
|
|
MathJax.Hub.Config({
|
|
|
|
|
tex2jax: {
|
|
|
|
|
inlineMath: [ ['$','$'], ["\\(","\\)"] ],
|
|
|
|
|
processEscapes: true
|
|
|
|
|
}
|
|
|
|
|
});
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
<script type="text/javascript"
|
|
|
|
|
src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
|
|
|
|
|
</script>
|
|
|
|
|
<script>
|
|
|
|
|
hljs.initHighlightingOnLoad();
|
|
|
|
|
|
|
|
|
|
document.querySelectorAll('.menuitem a').forEach(function(el) {
|
|
|
|
|
if (el.getAttribute('data-shortcut').length > 0) {
|
|
|
|
|
Mousetrap.bind(el.getAttribute('data-shortcut'), function() {
|
|
|
|
|
location.assign(el.getAttribute('href'));
|
|
|
|
|
});
|
|
|
|
|
}
|
|
|
|
|
});
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
