Comments (2)
dart-github-bot
commented on July 17, 2024
Summary: The toStringAsFixed(2) method and NumberFormat.decimalPatternDigits in Flutter fail to round numbers ending in 5 correctly, producing inconsistent results across different inputs. For example, 5.505 rounds to 5.50 instead of 5.51.
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mraleph
commented on July 17, 2024
That's how floating point numbers actually work. Floating point 5.505 is not the same as decimal number 5.505, so it absolutely correctly rounds to 5.5 if you ask less decimal digits.
I recommend:
- Learning how floating point numbers work: https://floating-point-gui.de/
- Never using floating point numbers for anything that requires correct decimal rounding (e.g. storing prices and monetary amounts).
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