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Groups > comp.lang.java.programmer > #3290
| From | Eric Sosman <esosman@ieee-dot-org.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Java left shift and right shift operators. |
| Date | 2011-04-26 21:14 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <ip7qne$al6$1@dont-email.me> (permalink) |
| References | <295e16b3-2ed8-4529-bfb0-1cc26ed93ad6@d26g2000prn.googlegroups.com> <1b558330-ae94-4e4e-9922-a9aeb63eaf37@d19g2000prh.googlegroups.com> <ip6ak8$6ie$1@dont-email.me> <44bbc323-c260-4169-ab2a-11b95d9e73e8@34g2000pru.googlegroups.com> |
On 4/26/2011 12:39 PM, Sanny wrote:
>>>> Is there any way to avoid the if condition and do right shift and left
>>>> shift using operators depending on shiftby is +ve or -ve?
>>
>>> I used below technique but it gives error.
>>
>>> divider=Math.pow(2,shiftby);
>>> then
>>> output = (long) N / divider;
>>
>> Let me get this straight: You're worried about the inefficiency
>> of an `if' that chooses between a left or a right shift, so you plan
>> to eliminate the `if' by evaluating an exponential function?
>>
>> ARE YOU OUT OF YOUR MIND?
>
> I didnt knew how much inefficient it is. I heard Math. (...) functions
> are very fast and they use Native support like assembly language so
> they are quite faster.
"Fast" is not an absolute, and neither is "very fast." If you
plant an acorn today and have a fifty-foot oak tree in ten years,
that's "fast." If you strike a match now and see a flame in ten
minutes, that's "slow" even though its half a million times faster
than the "fast" oak tree.
In other words, interpret "fast" in relation to the amount of
work being done.
> Is there a "Integer" in java which is longer than 64 bits?
> [...]
> I have heard of BigInteger I dont know how many bits it supports.
Perhaps the Javadoc for BigInteger might be helpful? Oh, no,
sorry, that's *way* too obvious, there must be a grue waiting for
anyone who tries to read the Javadoc. Never mind.
> Can I use byte[] to represent a longer number and do multiplications/
> divisions on them?
No. Somebody else could, if he were sufficiently masochistic,
but at your present level of Java proficiency[*] it's pretty clear
that you cannot.
[*] No offense: We all begin from ignorance. Your progress from
the starting point is not yet enough to enable you to do this task.
--
Eric Sosman
esosman@ieee-dot-org.invalid
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Java left shift and right shift operators. Sanny <softtanks22@hotmail.com> - 2011-04-26 00:38 -0700
Re: Java left shift and right shift operators. Lothar Kimmeringer <news200709@kimmeringer.de> - 2011-04-26 09:55 +0200
Re: Java left shift and right shift operators. Patricia Shanahan <pats@acm.org> - 2011-04-26 03:16 -0700
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-26 09:49 -0400
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Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-26 11:21 -0400
Re: Java left shift and right shift operators. Martin Gregorie <martin@address-in-sig.invalid> - 2011-04-26 15:37 +0000
Re: Java left shift and right shift operators. Sanny <softtanks22@hotmail.com> - 2011-04-26 09:32 -0700
Re: Java left shift and right shift operators. Patricia Shanahan <pats@acm.org> - 2011-04-26 11:09 -0700
Re: Java left shift and right shift operators. Patricia Shanahan <pats@acm.org> - 2011-04-26 13:09 -0700
Re: Java left shift and right shift operators. Travers Naran <tnaran@gmail.com> - 2011-04-26 22:40 -0700
Re: Java left shift and right shift operators. Patricia Shanahan <pats@acm.org> - 2011-04-27 05:34 -0700
Re: Java left shift and right shift operators. Owen Jacobson <angrybaldguy@gmail.com> - 2011-04-28 00:37 -0400
Re: Java left shift and right shift operators. Patricia Shanahan <pats@acm.org> - 2011-04-28 16:02 -0700
Re: Java left shift and right shift operators. Michael Wojcik <mwojcik@newsguy.com> - 2011-04-28 19:22 -0400
Re: Java left shift and right shift operators. bugbear <bugbear@trim_papermule.co.uk_trim> - 2011-04-27 14:28 +0100
Re: Java left shift and right shift operators. Thomas Richter <thor@math.tu-berlin.de> - 2011-04-30 00:02 +0200
Re: Java left shift and right shift operators. Roedy Green <see_website@mindprod.com.invalid> - 2011-04-27 19:25 -0700
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-27 23:08 -0400
Re: Java left shift and right shift operators. Sanny <softtanks22@hotmail.com> - 2011-04-26 02:04 -0700
Re: Java left shift and right shift operators. Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-26 07:34 -0400
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-26 09:47 -0400
Re: Java left shift and right shift operators. Patricia Shanahan <pats@acm.org> - 2011-04-27 09:23 -0700
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-27 14:49 -0400
Re: Java left shift and right shift operators. Paul Cager <paul.cager@googlemail.com> - 2011-04-27 17:28 -0700
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-27 22:06 -0400
Re: Java left shift and right shift operators. Sanny <softtanks22@hotmail.com> - 2011-04-26 09:39 -0700
Re: Java left shift and right shift operators. Patricia Shanahan <pats@acm.org> - 2011-04-26 11:17 -0700
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-26 14:55 -0400
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-26 14:57 -0400
Re: Java left shift and right shift operators. Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-04-26 21:38 +0200
Re: Java left shift and right shift operators. Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-26 23:32 +0000
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-27 00:08 -0400
Re: Java left shift and right shift operators. Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-27 06:57 +0000
Re: Java left shift and right shift operators. Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-27 07:00 -0300
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-27 08:42 -0400
Re: Java left shift and right shift operators. Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-27 14:03 +0000
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-27 14:54 -0400
Re: Java left shift and right shift operators. Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-26 21:14 -0400
Re: Java left shift and right shift operators. Travers Naran <tnaran@gmail.com> - 2011-04-26 07:30 -0700
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-26 11:24 -0400
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-26 11:35 -0400
Re: Java left shift and right shift operators. Sanny <softtanks22@hotmail.com> - 2011-04-26 09:46 -0700
Re: Java left shift and right shift operators. Lew <noone@lewscanon.com> - 2011-04-26 15:02 -0400
Re: Java left shift and right shift operators. Lothar Kimmeringer <news200709@kimmeringer.de> - 2011-04-28 09:14 +0200
Re: Java left shift and right shift operators. Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-04-26 08:41 -0400
Re: Java left shift and right shift operators. Robert Klemme <shortcutter@googlemail.com> - 2011-04-26 22:06 +0200
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