Online PHP editor | refs for BU6r4

<?php class Calculator { /** * Calculate the discount percentage */ function getDiscount($price=0, $sale=0) { $difference = $price-$sale; $discount = ($difference/$price) * 100; if($discount>0) { return $discount; } } } $calculator = new Calculator(); echo $calculator->getDiscount(23,24); if($calculator->getDiscount(23,24)==null){ echo 'No discount'; } echo round(3.4);