12 lines
1.5 KiB
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12 lines
1.5 KiB
HTML
<!doctype html><html lang="en"><meta charset="utf-8"><title>Collections and repeated work</title><h1>Collections and repeated work</h1><p>15-minute session: read for 3 minutes, trace for 3, experiment for 7, and complete the check for 2. Spend longer whenever you need.</p><p>A collection stores related values. The loop visits 1, 2, and 3, updating the total from 0 to 1, then 3, then 6. Record this trace rather than guessing. Identify the first and last valid positions in this language: Pascal can declare a 1-based array, while many other examples use zero-based containers. Add another value and update the bounds correctly. Explain what an empty collection should produce.</p><p><code>Main</code> is the entry method inside <code>Program</code>. <code>Console.WriteLine</code> prints a line. A class instance can have several references to the same object; assigning a reference does not clone the object.</p><pre><code class="language-csharp">using System;
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using System.Collections.Generic;
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class Program {
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static void Main() {
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int[] minutes = {1, 2, 3};
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int total = 0;
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foreach (int value in minutes) total += value;
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Console.WriteLine(total);
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}
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}
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</code></pre><p><strong>Expected result:</strong> <code>6</code></p><h3>Practice and evidence</h3><p>Keep three notes: your prediction, the actual result, and why they match or differ. The completion check grades understanding; the practice task builds skill.</p><p><a href="https://learn.microsoft.com/en-us/dotnet/csharp/tour-of-csharp/">Language reference</a></p></html> |