From: Marc-Andre Lafortune <ruby-core-mailing-list@...>
Date: 2021-07-01T18:55:20-04:00
Subject: [ruby-core:104467] Re: Float truncate

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I believe this to be a bug; I opened https://bugs.ruby-lang.org/issues/1801=
8

Thanks for reporting this


On Wed, Jun 16, 2021 at 3:36 PM Eust=C3=A1quio Rangel <eustaquiorangel@gmai=
l.com>
wrote:

> Hey Austin!
>
> Em qua., 16 de jun. de 2021 =C3=A0s 14:32, Austin Ziegler <halostatue@gma=
il.com>
> escreveu:
>
>> This isn=E2=80=99t related to float truncation, it=E2=80=99s related to =
the
>> approximate nature of float.
>>
>> [4] pry(main)> 291.4 * 100
>> =3D> 29139.999999999996
>>
>> https://bugs.ruby-lang.org/#Floating-point-numbers
>
>
> Yeah, meanwhile I was taking a look on some of the concepts, thanks for
> pointing out this URL! As I said, floats are known to be wild math beasts=
.
> :-)
>
>> If your client needs accuracy on this, they should be using BigDecimal.
>>
>> [12] pry(main)> BigDecimal('291.4').truncate(2)
>> =3D> 0.2914e3
>>
>
> Thanks! We also made some monkey patching on Float, to allow they truncat=
e
> converting first on a String.
>
> As a side note to the maintainers of the RubyMine gateway, this email
>> did not open a ticket in RubyMine. Is the gateway broken again?
>>
>
> I also noticed that.
>
> Thanks!
>
> Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=3Dunsubscrib=
e>
> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>
>

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<div dir=3D"ltr">I believe this to be a bug; I opened=C2=A0<a href=3D"https=
://bugs.ruby-lang.org/issues/18018">https://bugs.ruby-lang.org/issues/18018=
</a><div><br></div><div>Thanks for reporting this<br><div><div><br></div></=
div></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gm=
ail_attr">On Wed, Jun 16, 2021 at 3:36 PM Eust=C3=A1quio Rangel &lt;<a href=
=3D"mailto:eustaquiorangel@gmail.com">eustaquiorangel@gmail.com</a>&gt; wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div class=
=3D"gmail_default" style=3D"font-size:small">Hey Austin!</div><div class=3D=
"gmail_default" style=3D"font-size:small"><br></div><div class=3D"gmail_def=
ault" style=3D"font-size:small">Em qua., 16 de jun. de 2021 =C3=A0s 14:32, =
Austin Ziegler &lt;<a href=3D"mailto:halostatue@gmail.com" target=3D"_blank=
">halostatue@gmail.com</a>&gt; escreveu:<br></div></div><div class=3D"gmail=
_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,20=
4,204);padding-left:1ex">This isn=E2=80=99t related to float truncation, it=
=E2=80=99s related to the<br>
approximate nature of float.<br>
<br>
[4] pry(main)&gt; 291.4 * 100<br>
=3D&gt; 29139.999999999996<br>
<br>
<a href=3D"https://bugs.ruby-lang.org/#Floating-point-numbers" rel=3D"noref=
errer" target=3D"_blank"><span class=3D"gmail_default" style=3D"font-size:s=
mall"></span>https://bugs.ruby-lang.org/#Floating-point-numbers</a></blockq=
uote><div><br></div><div class=3D"gmail_default" style=3D"font-size:small">=
Yeah, meanwhile I was taking a look on some of the concepts, thanks for poi=
nting out this URL! As I said, floats are known to be wild math beasts. :-)=
</div><div class=3D"gmail_default" style=3D"font-size:small"></div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-wid=
th:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-l=
eft:1ex">If your client needs accuracy on this, they should be using BigDec=
imal.<br>
<br>
[12] pry(main)&gt; BigDecimal(&#39;291.4&#39;).truncate(2)<br>
=3D&gt; 0.2914e3<br></blockquote><div><br></div><div class=3D"gmail_default=
" style=3D"font-size:small">Thanks! We also made some monkey patching on Fl=
oat, to allow they truncate converting first on a String.</div><div class=
=3D"gmail_default" style=3D"font-size:small"><br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;borde=
r-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">As =
a side note to the maintainers of the RubyMine gateway, this email<br>
did not open a ticket in RubyMine. Is the gateway broken again?<br></blockq=
uote><div><br></div><div class=3D"gmail_default" style=3D"font-size:small">=
I also noticed that.=C2=A0<br><br>Thanks!</div></div></div>
<br>
Unsubscribe: &lt;mailto:<a href=3D"mailto:ruby-core-request@ruby-lang.org" =
target=3D"_blank">ruby-core-request@ruby-lang.org</a>?subject=3Dunsubscribe=
&gt;<br>
&lt;<a href=3D"http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core=
" rel=3D"noreferrer" target=3D"_blank">http://lists.ruby-lang.org/cgi-bin/m=
ailman/options/ruby-core</a>&gt;<br>
</blockquote></div>

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