Method Round

decimal.go:1523–1545

Round rounds the decimal to places decimal places. If places < 0, it will round the integer part to the nearest 10^(-places). Example: NewFromFloat(5.45).Round(1).String() // output: "5.5" NewFromFloat(545).Round(-1).String() // output: "550"

(places int32)

//	NewFromFloat(5.45).Round(1).String() // output: "5.5"
//	NewFromFloat(545).Round(-1).String() // output: "550"
func (d Decimal) Round(places int32) Decimal {
	if d.exp == -places {
		return d
	}
	// truncate to places + 1
	ret := d.rescale(-places - 1)

	// add sign(d) * 0.5
	if ret.value.Sign() < 0 {
		ret.value.Sub(ret.value, fiveInt)
	} else {
		ret.value.Add(ret.value, fiveInt)
	}

	// floor for positive numbers, ceil for negative numbers
	_, m := ret.value.DivMod(ret.value, tenInt, new(big.Int))
	ret.exp++
	if ret.value.Sign() < 0 && m.Cmp(zeroInt) != 0 {
		ret.value.Add(ret.value, oneInt)
	}

	return ret
}

// RoundCeil rounds the decimal towards +infinity.
//