Miscellany

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Math</title>
</head>

<body>
<fieldset>
	<legend>Do some math</legend>
		<form action="math.php" method="POST">
			<p><input type="text" name="fn" />&nbsp;&nbsp;<select name="select"><option>*</option><option>/</option><option>+</option><option>-</option></select>&nbsp;&nbsp;<input type="text" name="sn" /></p>
			<p><input type="submit" name="action" value="send" /></p>
		</form>
</fieldset>
<p>
<?php
	if($_POST['action'] == 'send') {
		$x = $_POST['fn'];
		$s = $_POST['select'];
		$a = $_POST['sn'];
		
		$answer = $x . $s . $a;
		
		echo("<div style=\"background: #FFFFF0; padding: 20px;\">$x $s $a = $answer</div>");
	} else { if($_POST['action'] == 'send' && $x && $a == '') {
			echo "you didn't enter anything in the inputs";
			}
		}
?>
</p>
</body>
</html>