Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"
 
PerlMonks  

Comment on

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

I am trying to figure out which of the multiple rounding techniques is used by perl's (and I suspect C) printf. I can not find anything that matches on the interwebs. Can anyone explain in detail the output of the following oneliner:

perl -e 'printf "%s => %.1f\n", ("0.${_}5") x 2 for (0..9)' 0.05 => 0.1 0.15 => 0.1 <-- this pair precludes even/odd 0.25 => 0.2 <-- rounding as explanation 0.35 => 0.3 0.45 => 0.5 <-- looks like the threshold of down/up rounding behavior 0.55 => 0.6 0.65 => 0.7 0.75 => 0.8 0.85 => 0.8 <-- except not quite :( 0.95 => 0.9

In reply to F***ing sprintf rounding - how does it work? by ribasushi

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!
  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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 rifling through the Monastery: (6)
    As of 2014-08-22 03:35 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The best computer themed movie is:











      Results (146 votes), past polls