Re: [Help-smalltalk] Bug, float is printed wrongly

2018-08-12 Thread 
The following seem to be related. 1/5000 is 2e-4; 1/1 is 1e-4 and so
all these lines should give the same result of -4. The conversion
"asExactFraction", which is called from the Float.st version of
floorLog:, causes a -5 answer which is wrong:


st>gst --version
GNU Smalltalk version 3.2.92-b033a21c

st> 1/5000 floorLog:10
-4
st> 1/1 floorLog:10
-4
st> 1e-4 asExactFraction
13743895/137438953472
st> (1e-4 asExactFraction) floorLog:10
-5
st> (2e-4 asExactFraction) floorLog:10
-4


The problem is caused by converting 1/1 to 13743895/137438953472,
which is just less than 1/1, so the floor operation shifts it to
1/10 and gets -5.

Thomas Worthington



Blake McBride writes:

> $ gst --version
> GNU Smalltalk version 3.2.92-dfe4b56
> $ gst
> GNU Smalltalk ready
>
> st> 1e1
> 10.0
> st> 1e0
> 1.0
> st> 1e-1
> 0.1
> st> 1e-2
> 0.01
> st> 1e-3
> 0.001
> st> 1e-4
> 0.1
> st>
>
>
>
>
>
> On Sat, Aug 11, 2018 at 1:05 PM Tommy Pettersson  wrote:
>
>> Hi,
>>
>> The float 1e-4 gets too many zeros when printed. This happens on version
>> 3.2.5 and on the current master branch at git://
>> git.sv.gnu.org/smalltalk.git,
>> on both 32-bit and 64-bit.
>>
>> Example:
>> st> x := 1e-4
>> 0.1
>> st> x+x
>> 0.0002
>>
>> Kind regards,
>> Tommy
>>
>> ___
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>>
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Re: [Help-smalltalk] Bug, float is printed wrongly

2018-08-11 Thread Blake McBride 
$ gst --version
GNU Smalltalk version 3.2.92-dfe4b56
$ gst
GNU Smalltalk ready

st> 1e1
10.0
st> 1e0
1.0
st> 1e-1
0.1
st> 1e-2
0.01
st> 1e-3
0.001
st> 1e-4
0.1
st>





On Sat, Aug 11, 2018 at 1:05 PM Tommy Pettersson  wrote:

> Hi,
>
> The float 1e-4 gets too many zeros when printed. This happens on version
> 3.2.5 and on the current master branch at git://
> git.sv.gnu.org/smalltalk.git,
> on both 32-bit and 64-bit.
>
> Example:
> st> x := 1e-4
> 0.1
> st> x+x
> 0.0002
>
> Kind regards,
> Tommy
>
> ___
> help-smalltalk mailing list
> help-smalltalk@gnu.org
> https://lists.gnu.org/mailman/listinfo/help-smalltalk
>
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Re: [Help-smalltalk] Bug, float is printed wrongly

2018-08-11 Thread Tommy Pettersson 
Hi Bill,

I think the ZeroDivide exception is unrelated, and caused by your gst being
compiled with option -pie (the default in many distros). If so, you would
get the same exception for 0.05 and many other numbers. Try compiling gst
with -no-pie to see if the exception goes away.

/Tommy

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Re: [Help-smalltalk] Bug, float is printed wrongly

2018-08-11 Thread bill-auger 
on debian 9:

$ gst
st> x := 1e-4
Object: 1 error: The program attempted to divide a number by zero
ZeroDivide(Exception)>>signal (ExcHandling.st:254)
SmallInteger(Number)>>zeroDivide (SysExcept.st:1426)
Fraction>>setNumerator:setDenominator: (Fraction.st:485)
Fraction class>>numerator:denominator: (Fraction.st:66)
Fraction>>- (Fraction.st:151)
FloatE(Float)>>printOn:special: (Float.st:533)
FloatE(Float)>>printOn: (Float.st:436)
FloatE(Object)>>printString (Object.st:534)
FloatE(Object)>>printNl (Object.st:571)


$ gst --version
GNU Smalltalk version 3.2.5
Copyright 2009 Free Software Foundation, Inc.
Written by Steve Byrne (s...@gnu.org) and Paolo Bonzini (bonz...@gnu.org)

GNU Smalltalk comes with NO WARRANTY, to the extent permitted by law.
You may redistribute copies of GNU Smalltalk under the terms of the
GNU General Public License.  For more information, see the file named
COPYING.

Using default kernel path: /usr/share/gnu-smalltalk/kernel
Using default image path: /usr/lib/gnu-smalltalk



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[Help-smalltalk] Bug, float is printed wrongly

2018-08-11 Thread Tommy Pettersson 
Hi,

The float 1e-4 gets too many zeros when printed. This happens on version
3.2.5 and on the current master branch at git://git.sv.gnu.org/smalltalk.git,
on both 32-bit and 64-bit.

Example:
st> x := 1e-4
0.1
st> x+x
0.0002

Kind regards,
Tommy

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