Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

It was surprising to me that your system doesn't show any apparent floating point error. This prompted me to (finally) try the OP's the code myself, and sure enough, I had perfect rounding, too! Yet the OP's output corresponds to what I would actually expect from a double precision IEEE-754 float:

perl -le 'printf "%.18f", 10.1' 10.099999999999999645

Suspecting skulduggery, I dug into the Spreadsheet::ParseExcel version 0.65 code, and I was not disappointed. See Utility.pm, around line 800. Indeed, the module does its own rounding because of RT#45626:

# Fix for Perl and sprintf not rounding up like Excel. # http://rt.cpan.org/Public/Bug/Display.html?id=45626 if ( $data =~ /^${number_result}5/ ) { $number_result = sprintf "%0${str_length}.${after_decimal}f", $data . '1'; }

This section was last changed ten years ago, suggesting OP may have a very old version, so your request for the version number was apropos.

Aside: The sub that's in is called ExcelFmt and is almost 900 lines long. The entire package is 45000 lines. I'm pretty sure the section around line 800 is responsible for the rounding, but that's a lot of code to grok in five minutes. I'd be happy to be corrected on the specifics, but the point is, something is doing the rounding. :-)

And yes, OP, I'd still suggest doing your own rounding for the reasons stated in my comment, to ensure you are rounding to your own specifications.


In reply to Re^2: Issue while reading decimal number from a Spreadsheet using perl by rjt
in thread Issue while reading decimal number from a Spreadsheet using perl by KishKishore

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others making s'mores by the fire in the courtyard of the Monastery: (4)
    As of 2020-04-06 01:09 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      The most amusing oxymoron is:
















      Results (36 votes). Check out past polls.

      Notices?