/**
* Counts the number of significative digits of $val.
* Assumes a consistent internal state (without zeros at the end or the start).
*
* @param Decimal $val
* @param Decimal $abs $val->abs()
* @return integer
*/
private static function countSignificativeDigits(Decimal $val, Decimal $abs)
{
return strlen($val->value) - ($abs->comp(DecimalConstants::One()) === -1 ? 2 : max($val->scale, 1)) - ($val->isNegative() ? 1 : 0);
}
public function testNegativeWithPositiveExponent()
{
$nFive = Decimal::fromInteger(-5);
$this->assertTrue($nFive->pow(DecimalConstants::One())->equals($nFive));
$this->assertTrue($nFive->pow(Decimal::fromInteger(2))->equals(Decimal::fromInteger(25)));
$this->assertTrue($nFive->pow(Decimal::fromInteger(3))->equals(Decimal::fromInteger(-125)));
}
