public $a;
public $b;
public $c;
function __construct($num1, $num2)
{
$this->a = $num1;
$this->b = $num2;
}
function add()
{
$this->c = $this->a + $this->b;
echo $this->c;
}
function substract()
{
$this->c = $this->a - $this->b;
echo $this->c;
}
}
$num1 = $_POST["num1"];
$num2 = $_POST["num2"];
$p = new calculator($num1, $num2);
$oper = $_POST["oper"];
switch ($oper) {
case "+":
$p->add();
break;
case "-":
$p->substract();
break;
}