Can someone explain to me what a bitwise shift is supposed to return and why?

Its not clear to me why:

8 << 0 = 8

8 << 8 = 2048

8 << 16 = 524288

8 << 24 = 134217728

8 << 32 = 8 <--------------- ???

I would expect 8 << 32 = 0;

I am working with IP address netmasks and I need to convert "/8" or "/16" into a working mask of "255.0.0.0" and "255.255.0.0".

255.255.255.255 << (32 - <cidr val>) gives me a valid mask except where the cidr val equals 32.

In reply to behavior of bitwise shift by ngiordano

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.