Programma in PHP
<html>
<head>
<style type="text/css">
body {
font-family: Arial, Helvetica, sans-serif;
font-size: 12px;
}
table tr td {
font-size: 12px;
padding: 5px;
}
fieldset {
border: 1px solid #555;
width: 400px;
margin: 5px;
display: inline-block;
vertical-align: top;
}
legend {
padding: 5px;
}
input {
border: 1px solid #CCC;
padding: 2px;
}
hr {
background: #EEE;
border: 0;
height: 1px;
}
</style>
<title>Priemgetallen</title>
</head>
<body>
<form action="" method="post">
<fieldset>
<legend>Check Priemgetal</legend>
<table>
<tr>
<td>Getal</td>
<td><input type="text" size="4" name="number" /></td>
<td><input type="submit" name="check" value="Controleer Getal" /></td>
</tr>
</table>
<?php
if($_SERVER['REQUEST_METHOD'] == "POST") {
$number = $_POST['number'];
if(isset($_POST['check']) && !empty($number) && is_numeric($number)) {
$gevondenDelers = 0;
for($i = 1; $i <= $number; $i=$i+1) {
$result = $number / $i;
if(is_int($result)) { // Is de uitkomst een geheel getal (integer)
echo $result." ";
$gevondenDelers = $gevondenDelers + 1;
}
}
Echo "<br/>";
if($gevondenDelers == 2) { // Precies 2 delers, 1 en zichzelf
echo '<span style="background: #DFFFE3; padding: 2px;">Het getal <b>' . $number . '</b> is een priemgetal.</span>';
}
else {
echo '<span style="background: #FFDFE3; padding: 2px;">Het getal <b>' . $number . '</b> is geen priemgetal.</span>';
}
}
}
?>
</fieldset>
</form>
