From: Ranieri Teixeira <ranieri.tx@...>
Date: 2008-02-08T08:15:03+09:00
Subject: Re: BigDecimal.new('15.25') == 15.25, false ??

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Hi, Henry
I'm writing a Ruby app that need very precise float point arithmetic. So,
I'm using BigDecimal and test my code with unit tests, at windows xp with
Ruby 1.8.6, also.

This seems a problem with float point number representation and comparison.

I wrote the following method, to test what you want to:

def *test_big_decimal*
    *assert_in_delta* 15.25, *BigDecimal*('15.25'), 0.001
end

And... it pass. I've found this type here, at ruby-talk. Do a search for a
message with "assert_equal problem" to see the reply.

Now, all my code in unit tests uses assert_in_delta, instead assert_equal o=
r
raw comparisons with assert and "=3D=3D".

I hope it help.

--=20
Ranieri Barros Teixeira
Ci=EAncia da Computa=E7=E3o  - Faculdade de Computa=E7=E3o - Universidade F=
ederal do
Par=E1 (UFPA)
http://rubyxchart.rubyforge.org
http://rubytags.blogspot.com

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