Hi Bob,
I'm doing data-processing (EDI). I need to format and present values in
text, round here and there. Have lots of various attempts that have failed
for one math related reason or another. Currently I convert to a string
and split and round, etc. (Even modulo '%' has failed me at times). So
this 0 comes across as -1.78. Tried printf("%.02f", $value) and got -0.00
back (negative 0?), so I'm not trusting that route much.
The documentation you refered me to (which didn't work on 2000, but luckily
I keep my Linux laptop near me at all times) refers to Math::BigFloat. If
you can think of a better package I'd go that route though.
Thanks,
Peter
P.S. Things are a little crazy here, so I'm getting chatty. Sorry if
there's too many words above.
|---------+------------------------------->
| | "Bob Showalter" |
| | <[EMAIL PROTECTED]|
| | rwhite.com> |
| | |
| | 08/21/2003 03:18 PM |
| | |
|---------+------------------------------->
>--------------------------------------------------------------------------------------------------------------|
|
|
| To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
|
| cc:
|
| Subject: RE: trouble with math... driving me nuts.
|
>--------------------------------------------------------------------------------------------------------------|
[EMAIL PROTECTED] wrote:
> Luckily I was easily able to recreate the problem. See code below:
>
> print 37.75 - 33.67 - 4.08 ;
> <STDIN>;
>
> I find these things all the time. Is there a particular
> module I can use
> to fix these things?
>
> Output is
>
> -1.77635683940025e-015
>
> Should be 0
That is zero, within the limits of the precision of floating point numbers.
Read the faq article:
perldoc -q 'long decimals'
There are a number of modules on CPAN that go beyond the FAQ to address
this
issue. What are you trying to do?
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