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<?php function celsiusToFahrenheit(float $c): float { return ($c * 9/5) + 32; } function fahrenheitToCelsius(float $f): float { return ($f - 32) * 5/9; } $temps = [0, 20, 37, 100]; echo "<table border=1 cellpadding=8 style='border-collapse:collapse'>"; echo "<tr style='background:#6366f1;color:white'><th>°C</th><th>°F</th></tr>"; foreach ($temps as $c) { $f = round(celsiusToFahrenheit($c), 1); echo "<tr><td>$c°C</td><td>$f°F</td></tr>"; } echo "</table>"; ?>
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