go roundfloat

// return rounded version of x with prec precision.
func roundFloat(x float64, prec int) float64 {
  var rounder float64
	pow := math.Pow(10, float64(prec))
	intermed := x * pow
	_, frac := math.Modf(intermed)
	intermed += .5
	x = .5
	if frac < 0.0 {
		x = -.5
		intermed -= 1
	}
	if frac >= x {
		rounder = math.Ceil(intermed)
	} else {
		rounder = math.Floor(intermed)
	}

	return rounder / pow
}