From: mike@... (Mike Stok)
Date: 2003-12-14T12:26:58+09:00
Subject: Re: .unpack("B*")

In article <brfo5f$fun$1@news.rz.uni-karlsruhe.de>,
Boris \"BXS\" Schulz <bxs@hadiko.de> wrote:

>And what can I do to adress the bits 
>individually ? Further, how do I get the binary values of an integer ?

I don't quite understand what this means, but

'ABCDE'.each_byte do |b|
  0.upto(7) do |bit|
    print "(#{b[bit]})"
  end
  print "\n"
end

prints

(1)(0)(0)(0)(0)(0)(1)(0)
(0)(1)(0)(0)(0)(0)(1)(0)
(1)(1)(0)(0)(0)(0)(1)(0)
(0)(0)(1)(0)(0)(0)(1)(0)
(1)(0)(1)(0)(0)(0)(1)(0)

where Fixnum#[] is used to access the bits of each byte

-------------------------------------------------------------- Fixnum#[]
     fix[ n ] -> 0, 1
------------------------------------------------------------------------
     Bit Reference---Returns the nth bit in the binary representation of
     fix, where fix[0] is the least significant bit.
        a = 0b11001100101010
        30.downto(0) do |n| print a[n] end
     produces:
        0000000000000000011001100101010

Hope this helps,

Mike

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