A little more of explanation: Realize the following decimal to binary correspondence:

128 = 10000000
64  = 01000000
32  = 00100000
16  = 00010000
8   = 00001000
4   = 00000100
2   = 00000010
1   = 00000001

[download]

A binary AND (&) compares bit to bit 2 numbers. If you have the number 123 (in binary: 01111011): 

123 & 128 =
  01111011 (123)
& 10000000 (128)
-----------
  00000000 (0)
= 0

123 & 64
  01111011 (123)
& 01000000 (64)
-----------
  01000000 (64)
= 64

123 & 32
  01111011 (123)
& 00100000 (32)
-----------
  00100000 (32)
= 32

And so on...

[download]

Hope this helps to clarify the script

citromatik

In reply to Re^2: Bitwise and operator question by citromatik
in thread Bitwise and operator question by Severy

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.