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# Shift operator

Suhita Reddy
Ranch Hand

Joined: Jun 09, 2006
Posts: 60
Hi,

There are 3 shift operators.>>,>>>,<<.

>> : x>>y means x/2powery.
<< : x<<y means x*2powery.
>>> : x>>>y means?
fred rosenberger
lowercase baba
Bartender

Joined: Oct 02, 2003
Posts: 11955

20

I forget which is which, but one of >> and >>> maintains the sign bit, and one doesn't.

Here is a quick overview i found when googling "java shift operators"

also, I'm not sure i'd really say that x>>y means x / 2^y. try it with y=32 (i think that's the right value), and you'll notice that nothing actually happens.
[ December 15, 2006: Message edited by: fred rosenberger ]

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Bert Bates
author
Sheriff

Joined: Oct 14, 2002
Posts: 8898

5
and remember everyone - this is a 1.4 topic but it's NOT a 5.0 topic

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kanon in
Greenhorn

Joined: Dec 17, 2006
Posts: 10
hi

x << y is left shift ( x*pow(2,y))
x >> y is right shift( x/pow(2,y)) with sign fill operator.
i.e while shiftg bits right the lower bits are discarded and higher bits are placed by 1 or 0 depending upon the sign bit of the no. here (x)

while in x >>> y , its right shift with Zero fill operator.
i.e lower bits will b discarded but higher bits will b replaced by 0 regardless of the sign bit of no. here (x).

Detail topic you can find in Khalid Mughal or Kathy Sierra.

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subject: Shift operator