<? 
echo("<form action=\"carpma.php\" method=\"post\" name=\"hesap\"><input name=\"hesap1\" type=\"text\" id=\"hesap1\" value=\"\" size=\"\">
<input name=\"hesap2\" type=\"text\" id=\"hesap2\" value=\"\"><input type=\"submit\" name=\"Submit\" value=\"Hesapla\">
</form>");
echo ($_POST["hesap1"] * $_POST["hesap2"]);
?>