/**
  *
  * @param
  * @return
  */
 function __construct($digits = 0)
 {
     parent::__construct();
     if ($digits === true) {
         $this->isZeroNoString = true;
         $this->d = 0;
     } else {
         $this->d = $digits;
     }
 }
 function __construct($digits = 0)
 {
     parent::__construct();
     $this->d = $digits;
 }