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Fwd: how this C code works?

To: linux-india-general@xxxxxxxxxxxxxxxxxxxxx
Subject: Fwd: how this C code works?
From: "Diwakar - tamil.com" <diwakaran@xxxxxxxxx>
Date: Thu, 25 Jan 2001 13:10:42 +0530

this came from a friend of mine. can somebody crack this? - Diwakar

This came as the Unix fortune - can someone decipher? Thanks, Alan -

#define BITCOUNT(x)     (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
#define  BX_(x)         ((x) - (((x)>>1)&0x77777777)                    \
                             - (((x)>>2)&0x33333333)                    \
                             - (((x)>>3)&0x11111111))


-- really weird C code to count the number of bits in a word

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