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1.3 KiB
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6 lines
1.3 KiB
HTML
<!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><code>fn main</code> is the entry point. <code>let</code> introduces a binding; <code>mut</code> permits reassignment. <code>println!</code> is a macro. A reference such as <code>&plan</code> borrows rather than transfers ownership.</p><pre><code class="language-rust">
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fn main() {
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let score = 85;
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if score >= 80 { println!("Ready"); } else { println!("Practice"); }
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}
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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://doc.rust-lang.org/book/">Language reference</a></p></html> |