initial commit

2025-11-17 13:49:43 +01:00
commit ac8bd4c5d7
1 changed files with 79 additions and 0 deletions
--- a/index.php
+++ b/index.php
@@ -0,0 +1,79 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>Primzahlen</title>
+    <style>
+        .wrapper {
+            display: flex;
+            flex-direction: row;
+            gap: 20px;
+
+        }
+    </style>
+</head>
+<body>
+<h1>Primzahlenberechnung</h1>
+<div class="wrapper">
+    <div>
+        <form action="index.php" method="post">
+            <label>Input:
+                <input type="number" name="input">
+            </label>
+            <button type="submit">Berechnen</button>
+        </form>
+
+        <?php
+        if(isset($_POST['input'])) {
+            $primeNumbers = [];
+            $max = (int) $_POST['input'];
+
+            for($i = 0; $i <= $max; $i++) {
+                if(isPrime($i)) {
+                    $primeNumbers[] = $i;
+                }
+            }
+
+            echo "<h3>Primzahlen von " . htmlspecialchars($_POST["input"], ENT_QUOTES, 'UTF-8') . " sind:</h3>";
+
+            foreach($primeNumbers as $number) {
+                echo "<span>" . $number . "</span><br>";
+            }
+        }
+
+        function isPrime($i) {
+            if ($i <= 1) return false;
+            if ($i <= 3) return true;
+            if ($i % 2 == 0) return false;
+
+            for ($j = 3; $j * $j <= $i; $j += 2) {
+                if ($i % $j == 0) {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+        ?>
+    </div>
+
+    <div>
+        <h3>Logarithmische Funktion (n = 1..100)</h3>
+        <div class="mono">
+            <?php
+            for ($n = 1; $n <= 100; $n++) {
+                $ln = log($n);
+                $lnFormatted = number_format($ln, 4, '.', '');
+
+                $starsCount = (int) floor($ln);
+                $stars = $starsCount > 0 ? str_repeat('*', $starsCount) : '-';
+
+                echo sprintf("%3d: ln=%6s  %s<br>", $n, $lnFormatted, $stars);
+            }
+            ?>
+        </div>
+    </div>
+</div>
+</body>
+</html>