Right Shift and Left shift operators

[badal manuj]

Can someone tell me an eay way of doing the right shift and left shift operations on ints and bytes ? (>>, << and >>>)
For example, if i want to calculate
279 >> 3 or -53 >>> 2
Is there a simpler way of doing it ?

Thanks.

[Anonymous]

I really don't know an easy way to do it, but I can tell you I didn't see anything nearly as complicated as your examples on the exam.
I recommend just trying to understand the concept. Understand what happens when you shift the bits. That's what the test is after.
Good Luck!

------------------
Brian Hoff
Sun Certified Programmer for the Java� 2 Platform
[This message has been edited by Brian Hoff (edited August 30, 2001).]

[Usha Damarla]

Very simple, if you can understand what I wrote here.
Say we have
"answer = M shift_operator N"
where M is the value to be shifted
N is the number of times to be shifted
"answer" is where the result gets stored
To make it simple let us divide the shift
operators into 2 categories
Category1 (right shift) will have
case1: M >> N
case2: -M >> N
case3: M >>> N
Formula:
answer = M/2^N
(In words, m divided by 2 to the power of N
(I don't know how to write power of N here)
Sign of "answer" = sign of M
if answer is not an integer
** take integer part only
(for ex: answer = 123.45, consider 123 only)
** add "1" to answer in case2.

Category2 (left shift) will have:
case4: M << N<br /> case5: -M << N<br /> Formula:<br /> answer = M * (2^N) <br /> (In words, M multiplied by 2 to the power of N)<br /> Sign of "answer" = sign of M<br /> <br /> Covering my explanation with an example:<br /> <br /> M N >> ->> >>> << -<<
-----------------------------------------------------------

129 4 8 -9 8 2064 -2064
272 2 68 -68 68 1088 -1088
745 1 372 -373 372 1490 -1490
123456 3 15432 -15432 15432 987648 -987648

I did not mention about case -M >>> N. I have not worked on it.
It always resuls in large numbers.
Does the exam centres permit to bring calculators?
The solution here is very simple with the use of a calculator.
You can tell the answer in less than 10 seconds.
Hope it is clear now. If it confuses just ignore.

[Usha Damarla]

I put indentation in message, but it does not show up after submitting it.
Anyway copy the table to some editor and put some spaces.

[badal manuj]

Thanks Usha,
That helped me a lot.