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>> operator

Hi,

I came accross this command line "#define PIDHASH_SZ (4096 >> 2)", but
I didn't find any information about the >> operator. Could anyway give
me a brief explanation?

Thanks,

Andre
Nov 14 '05 #1
2 1789
sieg1974 wrote:
Hi,

I came accross this command line "#define PIDHASH_SZ (4096 >> 2)", but
I didn't find any information about the >> operator. Could anyway give
me a brief explanation?


Right-shift.

4096 >> 2 is equal to 1024

Think bits. If we take 16 bit ints (for brevity):

4096 is 00010000 00000000

Right shift once:

00001000 00000000 (That's 2048)

Right shift again:

00000100 00000000 (That's 1024)

--
Richard Heathfield : bi****@eton.powernet.co.uk
"Usenet is a strange place." - Dennis M Ritchie, 29 July 1999.
C FAQ: http://www.eskimo.com/~scs/C-faq/top.html
K&R answers, C books, etc: http://users.powernet.co.uk/eton
Nov 14 '05 #2
sieg1974 wrote:
Hi,

I came accross this command line "#define PIDHASH_SZ (4096 >> 2)", but
I didn't find any information about the >> operator. Could anyway give
me a brief explanation?


'>>' is the right shift operator
(4096 >> 2) is 4096 shifted right two bits, or 1024.
One suspects that 4096 or 2 or both were symbolic constants in some earlier
form of the code.
--
Martin Ambuhl

Nov 14 '05 #3

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