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Fix mod when the divisor is slightly greater than the half of dividend (#312) (#317)

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zlasd 2024-01-10 09:08:45 +08:00 committed by GitHub
parent 1df8fb3015
commit 7b4ffbcd3c
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2 changed files with 4 additions and 2 deletions
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4
decimal.go
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@ -626,8 +626,8 @@ func (d Decimal) DivRound(d2 Decimal, precision int32) Decimal {
// Mod returns d % d2.
func (d Decimal) Mod(d2 Decimal) Decimal {
quo := d.DivRound(d2, -d.exp+1).Truncate(0)
return d.Sub(d2.Mul(quo))
_, r := d.QuoRem(d2, 0)
return r
}
// Pow returns d to the power d2

2
decimal_test.go
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@ -2147,6 +2147,8 @@ func TestDecimal_Mod(t *testing.T) {
Inp{"-7.5", "2"}: "-1.5",
Inp{"7.5", "-2"}: "1.5",
Inp{"-7.5", "-2"}: "-1.5",
Inp{"41", "21"}: "20",
Inp{"400000000001", "200000000001"}: "200000000000",
}
for inp, res := range inputs {