<br /> <br /> <?php if (isset($_POST["input1"]) and isset($_POST["input2"]) and isset($_POST["opera"])) { echo "Dato : "; $num1->stampN(); echo " "; echo "Dato : "; $num2->stampN(); echo "<br /><br />"; } ?> </form> </html> <?php if (isset($_POST["operazioni"])) { if ($_POST["operazioni"] == "somma" and isset($_POST["opera"])) { //$num1->somma($num2)->stampN(); $num3 = $num1->somma($num2); //echo "<br /><br />"; $num3->stampN(); } elseif ($_POST["operazioni"] == "sconto" and isset($_POST["opera"])) { $num3 = $num1->sconto($num2); $num3->stampN(); } }