Re: [Newbie] Breaking down bitvectors

From: Rick Glover (
Date: 11/29/98

-----Original Message-----
From: Matt Lowe <>
To: <>
Date: Saturday, November 28, 1998 11:16 PM
Subject:  [Newbie] Breaking down bitvectors

To breake down a bitvector you subtract and goto the next lowest
correct? Let me explaine.

Now if we add a, f and j together we get 145.

Well the lowest to 145 is j. So lets subtract 128(j's value) and we
get 17. Then lets goto the next lowest ... 16. So lets subtract 16.
(So far we have got j(128) and f(16)) Now we are left with one which
is the same as a. Is this the correct method?

This is the way you'd have to work it if you wanted to write something from
scratch, but there are tools in C/C++ using bitwise checks and changes that
simplify the whole process.  This is how the macros IS_SET, REMOVE_BIT, and
SET_BIT are derived.


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