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1.4 KiB
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5 lines
1.4 KiB
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<!doctype html><html lang="en"><meta charset="utf-8"><title>Values and decisions</title><h1>Values and decisions</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 decision chooses which statements run. The policy here is “ready at 80 or higher.” Trace 85, 79, 80, and 81 before running each case. The comparison includes 80. A program that prints the right answer for 85 may still be wrong at the boundary. Add a separate check rejecting scores below 0 or above 100; rejection and needing practice mean different things.</p><p>Line numbers describe program order. <code>GOSUB</code> visits a subroutine and <code>RETURN</code> resumes the caller. <code>SYSTEM</code> exits this interpreter. BASIC dialects differ: a 6502 or Z80 computer does not automatically run this exact dialect.</p><pre><code class="language-basic">10 LET S = 85
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20 IF S >= 80 THEN PRINT "Ready"
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30 IF S < 80 THEN PRINT "Practice"
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40 SYSTEM
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</code></pre><p><strong>Expected result:</strong> <code>Ready</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://packages.ubuntu.com/noble/bwbasic">Language reference</a></p></html> |