New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Rounding issue (expect round up, but down) #180

Open

tiendc opened this issue Sep 13, 2022 · 1 comment

tiendc commented Sep 13, 2022 •

edited

Loading

I have an issue with rounding numbers.

d, _ := decimal.New(0, 0).SetString("1.45")
fmt.Println(d.Round(2)) -> Expect: 1.5 actual: 1.4

d, _ := decimal.New(0, 0).SetString("1.5")
fmt.Println(d.Round(1)) -> Expect: 2 actual: 2 (seems not consistent with the above case)

d, _ := decimal.New(0, 0).SetString("1.451")
fmt.Println(d.Round(2)) -> Expect: 1.5 actual: 1.5 (correct)

Any investigation? thanks.

Contributor

lotodore commented Sep 28, 2022

You can use the context rounding mode to configure Round(...) et al.
https://pkg.go.dev/github.com/ericlagergren/decimal#Context

The default mode is roundTiesToEven and, as I see things, conforming to
https://en.wikipedia.org/wiki/IEEE_754-1985#Rounding_floating-point_numbers ("Round to Nearest")

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment