<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta name="author" content="Brandon Rozek"> <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 1st</h1> <h2>Control Structures</h2> <p>In this class we will talk about three types of control structures</p> <ul> <li>Sequential</li> <li>Selection</li> <li>Repetition</li> </ul> <p>Sequential is what is most familiar to us. Write the lines from top to bottom and it executes it in that order</p> <h3>Selection</h3> <p>Selection depends on the question of <code>if</code>. </p> <p>If it is raining, wear boots</p> <pre><code class="language-java">if (raining) { wearingBoots = true; }</code></pre> <p>If you want something to happen also when it is not true, consider an <code>if-else</code> statement</p> <p>If the light is off, turn it on.</p> <p>Otherwise, turn it on</p> <pre><code class="language-java">if (lightIsOn) { lightIsOn = false; } else { lightIsOn = true; }</code></pre> <p>Sometimes you can have multiple branches depending on a condition. Let us take a stop light as an example</p> <pre><code class="language-java">if (light == "red") { car.stop() } else if (light == "yellow") { car.slow() } else { car.go() }</code></pre> <h2>String comparison</h2> <p>There is a specific method in the <code>String</code> class when it comes to checking for string equality</p> <pre><code class="language-java">boolean equals(String s)</code></pre> <p>Let us look at an example</p> <pre><code class="language-java">String word = "hello"; boolean ans = word.equals("hello"); // Returns true boolean ans2 = word.equals("Hello"); // Returns false</code></pre> </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>