Method DivRound

decimal.go:648–670

DivRound divides and rounds to a given precision i.e. to an integer multiple of 10^(-precision) for a positive quotient digit 5 is rounded up, away from 0 if the quotient is negative then digit 5 is rounded down, away from 0 Note that precision<0 is allowed as input.

(d2 Decimal, precision int32)

//
// Note that precision<0 is allowed as input.
func (d Decimal) DivRound(d2 Decimal, precision int32) Decimal {
	// QuoRem already checks initialization
	q, r := d.QuoRem(d2, precision)
	// the actual rounding decision is based on comparing r*10^precision and d2/2
	// instead compare 2 r 10 ^precision and d2
	var rv2 big.Int
	rv2.Abs(r.value)
	rv2.Lsh(&rv2, 1)
	// now rv2 = abs(r.value) * 2
	r2 := Decimal{value: &rv2, exp: r.exp + precision}
	// r2 is now 2 * r * 10 ^ precision
	var c = r2.Cmp(d2.Abs())

	if c < 0 {
		return q
	}

	if d.value.Sign()*d2.value.Sign() < 0 {
		return q.Sub(New(1, -precision))
	}

	return q.Add(New(1, -precision))
}

// Mod returns d % d2.
func (d Decimal) Mod(d2 Decimal) Decimal {