From: Benoit Daloze <eregontp@...>
Date: 2010-01-16T07:01:30+09:00
Subject: [ruby-core:27602] Re: [Bug #2608] 1999.0 becomes 1998

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Welcome to the world of Float ;)
(look the mailing list about Float, we will not repeat the same 100 times ;)
)

~ $> ruby -ve 'p 19.99 * 100'
ruby 1.9.2dev (2010-01-14 trunk 26319) [x86_64-darwin10.2.0]
1998.9999999999998

In 1.9, you would be able to see the Float with all the decimals, with no
rounding like before.
(For once I admit this new view is quite useful, but I would do this
behavior only for #inspect, not #to_s)

Never expect Float to be exact, consider them as approximation.


2010/1/15 Edmond Chui <redmine@ruby-lang.org>

> Bug #2608: 1999.0 becomes 1998
> http://redmine.ruby-lang.org/issues/show/2608
>
> Author: Edmond Chui
> Status: Open, Priority: High
> ruby -v: 1.8.7
>
> The following script generate wrong result
>
> a = 19.99 * 100
> puts a.to_i  # Prints out 1998. Should be 1999.
>
>
> ----------------------------------------
> http://redmine.ruby-lang.org
>
>

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Welcome to the world of Float ;)<br>(look the mailing list about Float, we =
will not repeat the same 100 times ;) )<br><br>~ $&gt; ruby -ve &#39;p 19.9=
9 * 100&#39;<br>ruby 1.9.2dev (2010-01-14 trunk 26319) [x86_64-darwin10.2.0=
]<br>

1998.9999999999998<br><br>In 1.9, you would be able to see the Float with a=
ll the decimals, with no rounding like before.<br>(For once I admit this ne=
w view is quite useful, but I would do this behavior only for #inspect, not=
 #to_s)<br>

<br>Never expect Float to be exact, consider them as approximation.<br><br>=
<br><div class=3D"gmail_quote">2010/1/15 Edmond Chui <span dir=3D"ltr">&lt;=
<a href=3D"mailto:redmine@ruby-lang.org">redmine@ruby-lang.org</a>&gt;</spa=
n><br>

<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Bug #2608: 1999.0=
 becomes 1998<br>
<a href=3D"http://redmine.ruby-lang.org/issues/show/2608" target=3D"_blank"=
>http://redmine.ruby-lang.org/issues/show/2608</a><br>
<br>
Author: Edmond Chui<br>
Status: Open, Priority: High<br>
ruby -v: 1.8.7<br>
<br>
The following script generate wrong result<br>
<br>
a =3D 19.99 * 100<br>
puts a.to_i =A0# Prints out 1998. Should be 1999.<br>
<br>
<br>
----------------------------------------<br>
<a href=3D"http://redmine.ruby-lang.org" target=3D"_blank">http://redmine.r=
uby-lang.org</a><br>
<br>
</blockquote></div><br>

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