round.go

package main
 
import (
	"log"
	"math"
)
 
func Round(val float64, roundOn float64, places int ) (newVal float64) {
	var round float64
	pow := math.Pow(10, float64(places))
	digit := pow * val
	_, div := math.Modf(digit)
	_div := math.Copysign(div, val)
	_roundOn := math.Copysign(roundOn, val)
	if _div >= _roundOn {
		round = math.Ceil(digit)
	} else {
		round = math.Floor(digit)
	}
	newVal = round / pow
	return
}
 
func main() {
	log.Println(Round(7.503300000000001e-05, .5, 5))
	log.Println(Round(-7.503300000000001e-05, .5, 5))
}