}
function div()
{
$this->result = $this->fristnumb / $this->nextnumb;
echo $this->result;
}
}
$num1 = $_POST['num1'];
$num2 = $_POST['num2'];
$char = $_POST['char'];
switch ($char) {
case '+':
$add = new Calculator($num1, $num2);
$add->add();
break;
case '-':
$sub = new Calculator($num1, $num2);
$sub->sub();
break;
case '*':
$mul = new Calculator($num1, $num2);
$mul->mul();
break;
case '/':
$div = new Calculator($num1, $num2);
$div->div();
break;
default:
echo "输入有误";
break;
}