The spec

Which spec?

Unless I read this wrong, at least IEEE Std 1003.1-2017 (ie, the POSIX standard) defines NaN and Inf behavior for trunc . As did the older IEEE Std 1003.1-2008 edition.

And while not every implementation will follow POSIX, I don't feel I am wrong in expecting that following the behavior in an IEEE standard is reasonable behavior. And if it's reasonable behavior, then I don't feel I was wrong in arguing that the behavior makes sense for perl's int as well.

(And from what I remember of IEEE754 -- though it's been a while since I've read the relevant portions -- NaN was supposed to propagate if you try to do the various mathematical operators or functions on it. So my argument is in keeping with the spirit of that spec (at least as far as I remember it).)

update: I looked it up when I got to work the next day. IEEE 754-2008 section 6.2 "Operations with NaNs": "For an operation with quiet NaN inputs, other than maximum and minimum operations, if a floating-point result is to be delivered the result shall be a quiet NaN which should be one of the input NaNs." And in 6.2.3 "NaN Propagation": "An operation that propagates a NaN operand to its result and has a single NaN as an input should produce a NaN with the payload of the input NaN if representable in the destination format." Floating-point NaNs are intended to propagate.

In reply to Re^8: Weird behavior of int() by pryrt
in thread Weird behavior of int() by cLive ;-)

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, details, 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, summary, 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.