comparing two binary numbers

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comparing two binary numbers
\ Johnson Lau (11 May 2008)
. \ Li, Jialin (11 May 2008)
. \ Dr.Ruud (11 May 2008)
. \ sisyphus (11 May 2008)
. \ Chris Charley (11 May 2008)
. \ John W. Krahn (12 May 2008)
. \ Dr.Ruud (12 May 2008)

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Subject:	comparing two binary numbers
Group:	Perl-beginners
From:	Johnson Lau
Date:	11 May 2008

Dear all,

I need to compare two binary numbers and need perl to return the
number of matching bits.

For example:

$aaa = "10111100";
$bbb = "00101100";

In this case, the number of matching bits is 6.

I know I could split the strings and compare the bits one by one.
However, is there any faster functions for this? I need to compare
millions of such strings with 1000 bits for each.

Thanks a lot!!

Johnson Lau

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