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shift operators

Preetha Vasudevan
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Joined: Sep 23, 2005
Posts: 33
can anyone explain me how exactly the shift operations << ,>> and >>> work!!
Akhilesh Trivedi
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Joined: Jun 22, 2005
Posts: 1535
Hi Preetha!
Check out numbering over here.

http://www.coderanch.com/t/250859/java-programmer-SCJP/certification/Bitwise-Complement-Operator

Then come to shifts,

a << 3

Actually means shift/remove left most 3 bits and add three zeros in the other end.
For ex.
if a = 0000 0101 1101 0011 0000 0000 0000 1101 then
a<<3 would be
0010 1110 1001 1000 0000 00 0001 1010

similarly,
>>4 means remove right most 4 bits and add four sign bit yes sign-bit in the other end. (So +ve numbers will remain +ve and -ve will remain -ve)

>>> is called zero-filled shift. Same as above but fills zeros instead of sign bits. i.e. result will always be +ve. Hope this helps.

[ October 04, 2005: Message edited by: Akhil Trivedi ]
[ October 04, 2005: Message edited by: Akhil Trivedi ]

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Preetha Vasudevan
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Joined: Sep 23, 2005
Posts: 33
Thanks Akhil
Bert Bates
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Joined: Oct 14, 2002
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Richard Rex
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Joined: Sep 19, 2005
Posts: 100
Hi Akhil,

How about those right operands that are negative numbers. How is this done?

Ex.
a. 8 << -3 = 0
b. 8 >> -3 = 0
c. 8 >>> -3 = 0

Can you explain what is being done for negative numbers on the right operand? Can we move bit negatively?


"If you fail to plan, you plan to fail."<br /> <br />Chad<br />SCJP 1.4<br />SCWCD 1.4<br />SCBCD 1.3<br />SCDJWS (next)
Ramya Iyer
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Joined: Jul 29, 2003
Posts: 66
Please look at

http://www.coderanch.com/t/250975/java-programmer-SCJP/certification/Shift-Operators

The above thread provides the explanation if right operand is negative.
 
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