Rounding Value

[LaksamanaGuntur]

Describe the bug
I get a problem with rounding value

To Reproduce
your sample :
FlutterMoneyFormatter fmf = FlutterMoneyFormatter(
amount: 12345678.9012345
);
and output with print(fo.compactNonSymbol); is 12.30M

My sample :
i change amount with 12355678.9012345 (change number four to five)
and output with print(fo.compactNonSymbol); is 12.40M

Expected behavior
My Expectation is 12.35

Screenshots

Smartphone (please complete the following information):

• Device: [Xiaomi Redmi Note 5]
• OS: [8.1]

Thanks!

[fadhly-permata]

English Version:
Hi @LaksamanaGuntur, actually this is not part of flutter_money_formatter, the rounding results are obtained from the intl dependency.

However, as far as I know, rounding will usually use the round-up / round-down method by referring to the number on the right. So if we pay attention, the reason number 12355678.9012345 becomes 12.40M is, we will only take the first 4 digits (in your case that is, 1235), and the fourth number is 5, so the rounding method that will be used is definitely using the round-up method, and the result of rounding up from 1235 is 1240.

Remember, in the basic concept of rounding, the numbers 1,2,3,4 have definitely experienced round-down, and the numbers 5,6,7,8,9 have definitely been rounded up.

as an example:

525 = 500
717 = 700
1,250 = 1,300
2,781 = 2,800
4,524 = 4,500
5,359 = 5,400
6,168 = 6,000 + 100 + 68 = 6,000 + 100 + 100 = 6,200
6,998 = 6,000 + 900 + 98 = 6,000 + 900 + 100 = 7,000
10,343 = 10,000 + 300 + 43 = 10,000 + 300 + 0 = 10,300
7,423 = 7,400

Maybe if possible, in the next version I will add round-up and round-down features (by ignoring the basic concept of rounding numbers).

** N.B: **
Please review the concept of rounding, and as an additional reference from me, (since you are Indonesian) this is a good article that discusses rounding numbers.

---

Versi Indonesia
Hi @LaksamanaGuntur , sebetulnya hal ini bukan merupakan bagian dari flutter_money_formatter, hasil pembulatan tersebut didapat dari dependency intl.

Namun, sepanjang yang saya tau, pembulatan biasanya akan menggunakan metode pembulatan ke angka terdekat (round-up/round-down) dengan mengacu pada angka disebelah kanan. Jadi bila kita perhatikan, alasan angka 12355678.9012345 menjadi 12.40M adalah, kita hanya akan mengambil 4 digit pertama (pada kasus Anda yakni, 1235), dan angka ke-empat adalah 5, sehingga metode pembulatan yang akan digunakan sudah pasti menggunakan metode round-up (pembulatan ke-atas) dan hasil pembulatan ke atas dari 1235 adalah 1240.

Ingat, pada konsep dasar pembulatan, angka 1,2,3,4 sudah pasti mengalami pembulatan round-down, dan angka 5,6,7,8,9 sudah pasti mengalami pembulatan ke-atas.

sebagai contoh:

525 =  500
717 = 700
1.250 = 1.300
2.781 = 2.800
4.524 = 4.500
5.359 = 5.400
6.168 = 6.000 + 100 + 68 = 6.000 + 100 + 100 = 6.200
6.998 = 6.000 + 900 + 98 = 6.000 + 900 + 100 = 7.000
10.343 = 10.000 + 300 + 43 = 10.000 + 300 + 0 = 10.300
7.423 = 7.400

Mungkin bila memungkinkan, pada versi berikutnya akan saya tambahkan fitur round-up dan round-down (dengan mengabaikan konsep dasar pembulatan angka).

N.B:
Silahkan pelajari kembali konsep pembulatan, dan sebagai referensi tambahan dari saya, (berhubung Anda orang Indonesia) maka ini artikel bagus yang membahas mengenai pembulatan angka