Hi,
For my accounting I like to use ScaledDecimal, knowing it is just a fraction with a scale.
I just stumbled upon the following: 0.1s * 0.5s. "0.0s1"
The underlying fraction is correct (1/20). However, the scale is 1, which surprised me. Shouldn't the scale be 2?
In VA Smalltalk which I use for accounting as well the multiplication results in 0.05s2, which I had expected. (It prints as 0.05, though.)
Fraction>>#asScaledDecimal even has the needed code: "Convert the receiver to a ScaledDecimal. If there is a finite decimal representation of the receiver, then use the exact number of decimal places required. Else, use a default number of decimals."
(1/20) asScaledDecimal. "0.05s2"
Some other strangeness: 3s scale. "0" 3 asScaledDecimal scale. "0" 3s asScaledDecimal scale. "8"
ScaledDecimal>>#asScaledDecimal should probably just return self.
What do you think?
- Bernhard
Le lun. 10 juin 2019 à 17:33, Bernhard Pieber bernhard@pieber.com a écrit :
Hi,
For my accounting I like to use ScaledDecimal, knowing it is just a fraction with a scale.
I just stumbled upon the following: 0.1s * 0.5s. "0.0s1"
The underlying fraction is correct (1/20). However, the scale is 1, which surprised me. Shouldn't the scale be 2?
Maybe... But then what scale to use for division?
In VA Smalltalk which I use for accounting as well the multiplication
results in 0.05s2, which I had expected. (It prints as 0.05, though.)
Fraction>>#asScaledDecimal even has the needed code: "Convert the receiver to a ScaledDecimal. If there is a finite decimal representation of the receiver, then use the exact number of decimal places required. Else, use a default number of decimals."
(1/20) asScaledDecimal. "0.05s2"
Some other strangeness: 3s scale. "0" 3 asScaledDecimal scale. "0" 3s asScaledDecimal scale. "8"
ScaledDecimal>>#asScaledDecimal should probably just return self.
+1
What do you think?
- Bernhard
Wouldn't it be possible to do fraction division and then use the scale from the resulting Fraction>>#asScaledDecimal?
- Bernhard
Am 10.06.2019 um 18:01 schrieb Nicolas Cellier nicolas.cellier.aka.nice@gmail.com:
Le lun. 10 juin 2019 à 17:33, Bernhard Pieber bernhard@pieber.com a écrit : Hi,
For my accounting I like to use ScaledDecimal, knowing it is just a fraction with a scale.
I just stumbled upon the following: 0.1s * 0.5s. "0.0s1"
The underlying fraction is correct (1/20). However, the scale is 1, which surprised me. Shouldn't the scale be 2?
Maybe... But then what scale to use for division?
In VA Smalltalk which I use for accounting as well the multiplication results in 0.05s2, which I had expected. (It prints as 0.05, though.)
Fraction>>#asScaledDecimal even has the needed code: "Convert the receiver to a ScaledDecimal. If there is a finite decimal representation of the receiver, then use the exact number of decimal places required. Else, use a default number of decimals."
(1/20) asScaledDecimal. "0.05s2"
Some other strangeness: 3s scale. "0" 3 asScaledDecimal scale. "0" 3s asScaledDecimal scale. "8"
ScaledDecimal>>#asScaledDecimal should probably just return self.
+1
What do you think?
- Bernhard
squeak-dev@lists.squeakfoundation.org
-
Bernhard Pieber -
Nicolas Cellier