Hello John,
thanks for clarifying this.
This is not a scale bug. This is how the POSIX spec specifies
the computation. The 10 * 2.1 ends up doing the computation
with an effective scale of 1 ignoring the scale variable.
In the division, that one uses the scale variable.
I reported this upstream and received this reply:
From: Phil Nelson [EMAIL PROTECTED]
Subject: Re: Bc Scale Bug
To: [EMAIL PROTECTED]
Date: Sun, 28 Jan 2007 17:04:18 -0800
Resent-From: [EMAIL PROTECTED]
On Sunday 28 January 2007 16:57, you wrote:
$ echo scale=0; 10
Here is another message from upstream on this bug:
Here is the relavant part of the POSIX spec. scale is included, but
in a max(), not a min().
expression * expression
The result shall be the product of the two expressions. If a
and b are the
Hello John,
Am 2006-09-21 15:01:05, schrieb John Hasler:
Michelle Konzack writes:
1.06-8 which is installed on my laptop.
You are saying that 1.06-8 works correctly? 1.06-15 has the bug here.
It seems, there are more then one bug...
Tested for some secondas...
In 1.06-8 I have the
Am 2006-09-21 14:27:20, schrieb John Hasler:
In what version of bc did you first see the problem?
Since my old Laption run Woody, I do not know exactly, but I
uses the CD Sarge 3.1r0. Since many of my tools are plain
BASH scripts which are working properly since potato, I was
realy surprised,
Michelle Konzack writes:
Since my old Laption run Woody, I do not know exactly...
Ok. We know the bug arrived between -8 and -15. I think I can narrow it
down from the changelog. Looks like it has to be either the bc.y patch or
a tool or library change.
--
John Hasler
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Am 2006-09-20 13:10:53, schrieb John Hasler:
Scale does not affect all operations. From the man page:
There are four special variables, scale, ibase, obase, and last.
scale defines how some operations use digits after the decimal
point.
Which mean, scale=0 will output
Am 2006-09-20 15:55:32, schrieb John Hasler:
I have tried it under Woody and it works...
What version?
1.06-8 which is installed on my laptop.
Thanks, Greetings and nice Evening
Michelle Konzack
--
Linux-User #280138 with the Linux Counter, http://counter.li.org/
Michelle Konzack writes:
1.06-8 which is installed on my laptop.
You are saying that 1.06-8 works correctly? 1.06-15 has the bug here.
--
John Hasler
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Elmwood, WI USA
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I quoted:
There are four special variables, scale, ibase, obase, and last.
scale defines how _some_ operations use digits after the decimal
point.
Michelle Konzack writes:
Which mean, scale=0 will output N while scale=2 output N.nn.
Which it not does.
Note that it says
Package: bc
Version: 1.06-19
Severity: normal
scale is not always evaluated it seems:
$ echo scale=0; 10 * 2.1 | bc
21.0
$ echo scale=0; ( 10 * 2.1 ) / 1 | bc
21
Shouldn't that yield '21' twice?
I don't quite see a reason for the current behaviour, nor
could a quick look into the docs reveal
Scale does not affect all operations. From the man page:
There are four special variables, scale, ibase, obase, and last.
scale defines how some operations use digits after the decimal
point.
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John Hasler
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Hello Tobias and Maintainer,
Am 2006-09-20 19:22:54, schrieb Tobias Richter:
Package: bc
Version: 1.06-19
Severity: normal
scale is not always evaluated it seems:
$ echo scale=0; 10 * 2.1 | bc
21.0
$ echo scale=0; ( 10 * 2.1 ) / 1 | bc
21
Shouldn't that yield '21' twice?
Yes
I
I will forward this upstream.
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John Hasler
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I have tried it under Woody and it works...
What version?
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John Hasler
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Elmwood, WI USA
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