/**
* Sub two Numbers
* $l - $r
*
* @param VONumber $l
* @param VONumber $r
*
* @return VONumber
*/
public function sub(VONumber $l, VONumber $r)
{
if ($l instanceof IntegerNumber && $r instanceof IntegerNumber) {
return new IntegerNumber(bcsub($l->__toString(), $r->__toString()));
} else {
$scale = FloatNumber::getScales($l, $r);
$res = new FloatNumber(bcsub($l->__toString(), $r->__toString(), $scale[1]), $scale[0]);
return $res;
}
}
