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130 lines
3.8 KiB
HTML
130 lines
3.8 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<meta name="author" content="Brandon Rozek">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="robots" content="noindex" />
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<title>Brandon Rozek</title>
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<link rel="stylesheet" href="themes/bitsandpieces/styles/main.css" type="text/css" />
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<link rel="stylesheet" href="themes/bitsandpieces/styles/highlightjs-github.css" type="text/css" />
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</head>
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<body>
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<aside class="main-nav">
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<nav>
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<ul>
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<li class="menuitem ">
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<a href="index.html%3Findex.html" data-shortcut="">
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Home
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Fcourses.html" data-shortcut="">
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Courses
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Flabaide.html" data-shortcut="">
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Lab Aide
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Fpresentations.html" data-shortcut="">
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Presentations
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Fresearch.html" data-shortcut="">
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Research
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Ftranscript.html" data-shortcut="">
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Transcript
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</a>
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</li>
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</ul>
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</nav>
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</aside>
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<main class="main-content">
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<article class="article">
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<h1>Lecture for February 13</h1>
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<h2>Loops</h2>
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<h3>Why Loops?</h3>
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<p>While some check is true, repeat the work.</p>
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<p>While the cookies aren't baked, keep baking</p>
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<h3>Loop Building Process</h3>
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<ol>
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<li>Identify one test that must be true when the loop is finished</li>
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<li>Use the <strong>opposite</strong> form of the test</li>
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<li>Within loop, make <em>progress</em> towards completion of the goal.</li>
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</ol>
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<h3>While syntax</h3>
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<pre><code class="language-java">while (expression) {
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// Loop body executes if expression is true
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}
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// Statements execute after expression is false</code></pre>
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<h3>Getting Input (Songs in a Playlist Psuedocode)</h3>
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<pre><code class="language-java">// Ask user about first song
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while (user says play next song) {
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// play next song
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// ask user about next song
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}</code></pre>
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<h3>Nested Loops</h3>
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<p>You can have loops inside loops</p>
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<pre><code class="language-java">int outer = 1;
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while (outer < 4) {
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int inner = 1;
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while (inner < 4) {
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System.out.println(outer + ":" + inner);
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inner++;
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}
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outer++;
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}</code></pre>
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<p>This code does the following</p>
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<pre><code class="language-reStructuredText">1:1
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1:2
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1:3
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2:1
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2:2
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2:3
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3:1
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3:2
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3:3</code></pre>
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<h3>Break Down the Problem</h3>
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<p>Never write the entire program at once! This makes it incredibly hard to debug. Instead break it into small parts.</p>
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<p>Write one part -> debug until it works</p>
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<p>Write second part -> debug until it works</p>
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<p>This way you know which part of your code failed, instead of having everything fail.</p>
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</article>
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</main>
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