/**
* @dataProvider getPositionForExponentProvider
*/
public function testGetPositionForExponent($exponent, DecimalValue $decimal, $expected)
{
$math = new DecimalMath();
$actual = $math->getPositionForExponent($exponent, $decimal);
$this->assertSame($expected, $actual);
}
/**
* Returns the number of significant figures in the amount-string,
* counting the decimal point, but not counting the leading sign.
*
* Note that this calculation assumes a symmetric uncertainty interval, and can be misleading
*
* @since 0.1
*
* @return int
*/
public function getSignificantFigures()
{
$math = new DecimalMath();
// $orderOfUncertainty is +/- 200 -> 2; +/- 0.02 -> -2
$orderOfUncertainty = $this->getOrderOfUncertainty();
// the number of digits (without the sign) is the same as the position (with the sign).
$significantDigits = $math->getPositionForExponent($orderOfUncertainty, $this->amount);
return $significantDigits;
}
