Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

comment on

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

Edit: I realise now that this is not a good answer to your question, so scratch that. I need to go now, so can't fix it in the next minutes - sorry for the noise.

The issue is, as ever so often, limited accuracy of floating point calculations. The number 1.15 can not be represented exactly as a floating point number, so the representation is either a tiny bit below, or a tiny bit above 1.15.

Apparently it is a tiny bit below 1.15, so the result of the multiplication is a tiny bit below 195.5, and after the addition of 0.5 you get something a tiny bit below 196.

The int function doesn't care about how tiny that bit might be, it happily throws away everything below 196 because, well, it is less than 196.

There's nothing magical about the number 170: The tiny error is either negative or positive, and whenever it is negative, int will behave like that.

So, using printf is a well accepted way to get around this issue, because it gets the rounding right for normal expectations.


In reply to Re: int() function by haj
in thread int() function by geoperl

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 perusing the Monastery: (7)
    As of 2021-03-08 10:30 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      My favorite kind of desktop background is:











      Results (124 votes). Check out past polls.

      Notices?