79 lines
2.0 KiB
PHP
79 lines
2.0 KiB
PHP
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Primzahlen</title>
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<style>
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.wrapper {
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display: flex;
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flex-direction: row;
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gap: 20px;
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}
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</style>
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</head>
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<body>
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<h1>Primzahlenberechnung</h1>
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<div class="wrapper">
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<div>
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<form action="index.php" method="post">
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<label>Input:
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<input type="number" name="input">
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</label>
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<button type="submit">Berechnen</button>
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</form>
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<?php
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if(isset($_POST['input'])) {
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$primeNumbers = [];
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$max = (int) $_POST['input'];
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for($i = 0; $i <= $max; $i++) {
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if(isPrime($i)) {
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$primeNumbers[] = $i;
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}
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}
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echo "<h3>Primzahlen von " . htmlspecialchars($_POST["input"], ENT_QUOTES, 'UTF-8') . " sind:</h3>";
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foreach($primeNumbers as $number) {
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echo "<span>" . $number . "</span><br>";
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}
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}
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function isPrime($i) {
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if ($i <= 1) return false;
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if ($i <= 3) return true;
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if ($i % 2 == 0) return false;
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for ($j = 3; $j * $j <= $i; $j += 2) {
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if ($i % $j == 0) {
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return false;
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}
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}
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return true;
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}
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?>
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</div>
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<div>
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<h3>Logarithmische Funktion (n = 1..100)</h3>
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<div class="mono">
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<?php
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for ($n = 1; $n <= 100; $n++) {
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$ln = log($n);
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$lnFormatted = number_format($ln, 4, '.', '');
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$starsCount = (int) floor($ln);
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$stars = $starsCount > 0 ? str_repeat('*', $starsCount) : '-';
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echo sprintf("%3d: ln=%6s %s<br>", $n, $lnFormatted, $stars);
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}
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?>
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</div>
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</div>
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</div>
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</body>
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</html>
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