in reply to Bug? 1+1 != 2

The problem is pretty simple, as others have stated and is due to the rounding off of floating point numbers.

The real problem is however, that this is a Very Frequently Asked Question and as such, should be answered in the FAQ.

Of course the question in perlfaq4:

perldoc -q Why am I getting long decimals (eg, 19.9499999999999) inste
+ad of the numbers I should be getting (eg, 19.95)?

[download]
in essence answers this question, but it could be indexed with a different heading, something like:
Why don't my floating point numbers equal each other?

[download]


--
Regards,
Helgi Briem
helgi DOT briem AT decode DOT is

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Re: Re: Bug? 1+1 != 2
by shotgunefx (Parson) on Jun 19, 2003 at 10:59 UTC
    I figured it was along those lines as "eq" worked. Any idea on how Perl decides to format the stringified number? I looked at $# but it says it's depreciated so I would think it lies elsewhere.

    -Lee

    "To be civilized is to deny one's nature."
[reply]
      The internal decision about how Perl "stringifies" floats are quite well described in perlnumber; if you need different conversions, you have to resort to printf and explicit rounding.
[reply]
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