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Witam,
Mam taką oto klasę. Nie wiem czemu gdy sprawdzam var_dump wywołanie metody calculate() to wyrzuca mi NULL ? Czy dobry mam ten zapis klasy czy należy to zrobić trochę inaczej ? ...

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class Calculator
{
   private $lefthandoperator;
   private $righthandoperator;
   private $operation;
 
   public function __construct($operation, $lefthandoperator, $righthandoperator)
   {
      $this->operation = $operation;
      $this->lefthandoperator = $lefthandoperator;
      $this->righthandoperator = $righthandoperator;
   }
 
   private function add()
   {
      return $this->lefthandoperator + $this->righthandoperator;
   }
 
   private function subtract()
   {
      return $this->lefthandoperator - $this->righthandoperator;
   }
 
   private function multiply()
   {
      return $this->lefthandoperator * $this->righthandoperator;
   }
 
   private function divide()
   {
      return $this->lefthandoperator / $this->righthandoperator;
   }
 
   private function logicaland()
   {
      return $this->lefthandoperator && $this->righthandoperator;
   }
 
   private function logicalor()
   {
      return $this->lefthandoperator || $this->righthandoperator;
   }
 
   public function calculate()
   {
      switch ($this->operation) {
         case 'add':
            $this->add();
            break;
         case 'subtract':
            $this->subtract();
            break;
         case 'multiply':
            $this->multiply();
            break;
         case 'divide':
            $this->divide();
            break;
         case 'logicaland':
            $this->logicaland();
            break;
         case 'logicalor':
            $this->logicalor();
            break;
      }
   }
}
 
 
$calculator = new Calculator('add', 4, 2);
$calculator->calculate();
 
var_dump($calculator->calculate());
 
 
[PHP] pobierz, plaintext 

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Ten post edytował damianooo 22.07.2013, 15:31:09