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Re: [Help-smalltalk] 1e-4 printing bug
From: |
Thomas Worthington |
Subject: |
Re: [Help-smalltalk] 1e-4 printing bug |
Date: |
Thu, 18 Apr 2019 14:40:41 +0100 |
User-agent: |
mu4e 1.1.0; emacs 26.1 |
Derek,
Are you saying that when I type
1e-4 asFraction
and get
1/10000
that's wrong, then?
It seems pretty obvious that if asFraction returns the right answer and
asExactFraction returns the wrong answer, then there is a bug in the latter and
not the former. Starting with the same input, there is no reason why they
should return different answers in this particular case.
It may simply be a case of asExactFraction being mis-named. The comment in the
code even uses the word "approximation".
More strangeness:
(10 raisedTo: -4) asExactFraction
1/10000
(10 raisedTo: -4) asFloat
0.0001
1e-4
0.00001
So, I think we can firmly state that the problem here is not in the output
routines. It may in fact be the input routine (i.e., the parser).
Thomas
Derek Zhou writes:
> Thomas Worthington writes:
>
>> If 13743895/137438953472 == 1/10000 then 137438953472/13743895 == 10000,
>> which it clearly does not, so it seem to me still to be an underlying issue
>> with asExactFraction or some related method.
>
> 1e-4 is a floating point number which is not the same as 1/10000 the
> fraction.
>
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