Sans nom

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fr" lang="fr">
    <head>
        <title></title>
        <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
    </head>
    <body>
	
		<?php 
		if (isset($_POST['rayon']) && isset($_POST['hauteur'])) { $volume = volume($_POST['rayon'], $_POST['hauteur']); }
		{
			function volume($rayon, $hauteur)
			{
			$volume=$rayon*$rayon*3.14*$hauteur*(1/3);
			return $volume;
			}
			$volume = volume($_POST['rayon'], $_POST['hauteur']);
			echo "Le volume du cone est de $volume";
		}	
		else
		{
		echo <form method="post" action="calcul.php">;
		echo <p>Rayon<input type="text" name="rayon"/></p>;
		echo <p>Hauteur<input type="text" name="hauteur"/></p>;
		echo <input type="submit" value="Calculer"/>;
		echo </form>;
		}		
		?>
    </body>
</html>