2020-01-15 23:07:02 -05:00
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2022-02-15 01:14:58 -05:00
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2020-01-15 23:07:02 -05:00
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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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