}
	}
}

func TestMulByLog10Log2(t *testing.T) {
	for x := -500; x <= +500; x++ {
		iMath := MulByLog10Log2(x)
		fMath := int(math.Floor(float64(x) * math.Ln10 / math.Ln2))
		if iMath != fMath {
			t.Errorf("mulByLog10Log2(%d) failed: %d vs %d\n", x, iMath, fMath)
		}
	}

}

func ParseFloatPrefix(s string, bitSize int) (float64, int, error) {
	return parseFloatPrefix(s, bitSize)
}

func MulByLog2Log10(x int) int {
	return mulByLog2Log10(x)
}

func MulByLog10Log2(x int) int {
	return mulByLog10Log2(x)

	return (x * 78913) >> 18
}

// mulByLog10Log2 returns math.Floor(x * log(10)/log(2)) for an integer x in
// the range -500 <= x && x <= +500.
//
// The range restriction lets us work in faster integer arithmetic instead of
// slower floating point arithmetic. Correctness is verified by unit tests.
func mulByLog10Log2(x int) int {
	// log(10)/log(2) ≈ 3.32192809489 ≈ 108853 / 2^15