Possible Loss Of Precision??

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sauron - 20 May 2004 12:25 GMT

I got this error when writing a method.

Here's the code...

public int getPrice(){
return price;
}

Can anyone tell me what this means?

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Christophe Vanfleteren - 20 May 2004 12:46 GMT

> I got this error when writing a method.
>
[quoted text clipped - 5 lines]
>
> Can anyone tell me what this means?

Are you sure price is declared to be an int? If it is declared as a long,
returning it as an int will let you lose precision if the value is larger
than Integer.MAX_VALUE (2^32-1).
The compiler will warn you about cases like this.
You can get around it by explicitly casting the long to an int like this:

public int getPrice(){
return (int)price;
}

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Kind regards,
Christophe Vanfleteren

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Andrew Thompson - 20 May 2004 13:16 GMT

> ...you lose precision if the value is larger
> than Integer.MAX_VALUE (2^32-1).

...

> public int getPrice(){

Even at the value of (Australian!) cents,
that is a *lot* of money..

[ ..and if you were funneling the 'loss of
precision error' to a bank account in the
Canary Islands, I suspect you would die
cold, hungry, ..and in jail! ;-) ]

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Andrew Thompson
http://www.PhySci.org/ Open-source software suite
http://www.PhySci.org/codes/ Web & IT Help
http://www.1point1C.org/ Science & Technology

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Ryan Stewart - 20 May 2004 12:49 GMT

> I got this error when writing a method.
>
[quoted text clipped - 5 lines]
>
> Can anyone tell me what this means?

It means that price is a long, float, or double, and you're trying to
squeeze it into an int. Doing so could result in a loss of precision, so the
compiler wants you to explicitly cast it so it knows you know what you're
doing:
public int getPrice() {
return (int) price;
}

In the future, please try to provide a complete, compileable example that
demonstrates your problem. You'll generally get more specific answers if you
do so. See this document for pointers:
http://www.physci.org/codes/sscce.jsp

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John - 20 May 2004 13:25 GMT

>>I got this error when writing a method.
>>
[quoted text clipped - 18 lines]
> do so. See this document for pointers:
> http://www.physci.org/codes/sscce.jsp

Oh my god. I thought we only had to contend with two self-publicists in
the group: Roedy and Andrew. Now it seems that Andrew has obtained a
minion. I look forward to seeing Roedy rallying his forces in the
counter attack.

John

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Alex Hunsley - 20 May 2004 14:08 GMT

>>> I got this error when writing a method.
>>>
[quoted text clipped - 25 lines]
> minion. I look forward to seeing Roedy rallying his forces in the
> counter attack.

Yeah, posting helpful links is a really bad thing, isn't it?
Someone's got a bee in their bonnet.

alex

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John - 20 May 2004 15:47 GMT

>>>> I got this error when writing a method.
>>>>
[quoted text clipped - 32 lines]
>
> alex

There's nothing for me to have " a bee in [my] bonnet" about. I'm just
poking fun at Andrew, Roedy and the new minion. Don't take things too
seriously Alex.

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Andrew Thompson - 20 May 2004 16:15 GMT

(Ryan Stewart)

>>>> ..See this document for pointers:
>>>> http://www.physci.org/codes/sscce.jsp

...

>>> Oh my god. I thought we only had to contend with two self-publicists
>>> in the group: Roedy and Andrew. Now it seems that Andrew has obtained
>>> a minion.

...

> There's nothing for me to have " a bee in [my] bonnet" about. I'm just
> poking fun at Andrew, Roedy and the new minion.

You do realise, don't you, that for every visitor
that hits that page, I get the difference between
whatever is currently in their bank account, and
2^31-1 (I split it with Ryan.. 50/50). ;-)

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Andrew Thompson
http://www.PhySci.org/ Open-source software suite
http://www.PhySci.org/codes/ Web & IT Help
http://www.1point1C.org/ Science & Technology

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Christophe Vanfleteren - 20 May 2004 16:25 GMT

> You do realise, don't you, that for every visitor
> that hits that page, I get the difference between
> whatever is currently in their bank account, and
> 2^31-1 (I split it with Ryan.. 50/50). ;-)

Do you have an official affiliates program going? I might want to get in :)

Signature

Kind regards,
Christophe Vanfleteren

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Andrew Thompson - 20 May 2004 17:49 GMT

>> You do realise, don't you, that for every visitor
>> that hits that page, I get the difference between
>> whatever is currently in their bank account, and
>> 2^31-1 (I split it with Ryan.. 50/50). ;-)
>
> Do you have an official affiliates program going? I might want to get in :)

<it must be late>

Dear MR CHRISTOPHE VANFLATEREN,

Thank you for your interest in our exciting
new franchising operation with the unique
'pyramid-like' structure.

Our funds management company based in
DEMOCRATIC REPUBLIC OF CONGO will happily
marketing bridges in Brooklyn and selling
hand picked range of albino elephants.

Please send details of your banking
accounts so that US $10 Million of
funds from expired accounts may be
transferred through them with expeditiously.

YOURS WITH REGARD, YOUR GOOD FRIEND,
Hit-n-Miss Fund Mgmt. Co. Inc.
(New York, Canary Islands, Tanu Tuva)

</it must be late> ;-)

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Alex Hunsley - 20 May 2004 19:55 GMT

>>>>> I got this error when writing a method.
>>>>>
[quoted text clipped - 36 lines]
> poking fun at Andrew, Roedy and the new minion. Don't take things too
> seriously Alex.

Oops, sorry, I thought you were genuinely taking him to task! My bad.

alex

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Roedy Green - 20 May 2004 17:04 GMT

>Oh my god. I thought we only had to contend with two self-publicists in
>the group: Roedy and Andrew. Now it seems that Andrew has obtained a
>minion. I look forward to seeing Roedy rallying his forces in the
>counter attack.

Would you sooner I posted the same answers out long hand time after
time? Would you sooner I wrote ones off the top of my head each time
rather than polishing the same old answer? Would you sooner I kept the
answers to myself?

I think you have things rigged so I would never gain your approval no
matter what my behaviour.

Have you ever tried clicking the links I provide to see if they are
ads or indeed answers to the question?

Signature

Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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John - 20 May 2004 17:34 GMT

>>Oh my god. I thought we only had to contend with two self-publicists in
>>the group: Roedy and Andrew. Now it seems that Andrew has obtained a
[quoted text clipped - 3 lines]
> Would you sooner I posted the same answers out long hand time after
> time?

No.

> Would you sooner I wrote ones off the top of my head each time
> rather than polishing the same old answer?

No.

> Would you sooner I kept the
> answers to myself?

No. I'd sooner you were prepared to take yourself a tiny bit less
seriously. You help all the newbs out very patiently, and I suppose that
hosting pages of solutions is a useful tool in doing that.

It just seems quite funny (to me) to see you, Andrew and his minion
posting links to your own sites (as if seeking publicity). I am fully
aware of the good it does, but it doesn't mean I can't wind you up about it.

> I think you have things rigged so I would never gain your approval no
> matter what my behaviour.

Please don't get too paranoid. You already have my approval (see
comments above).

> Have you ever tried clicking the links I provide to see if they are
> ads or indeed answers to the question?

I have indeed. You must have put a few man-years into that site of yours.

Anyway, what i'm interested in is how are you going to react to the
advent of The Minion? Andrew has thrown down the gauntlet and nailed his
colours to the mast with this swell in numbers. I can almost sense the
bandwidth switching to http://www.physci.org/codes/sscce.jsp rather
than http://mindprod.com/jgloss/errormessages.html .

I look forward to reading up on the battle at
http://www.physci.org/secretweapons/the_minion.htm

John

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Andrew Thompson - 20 May 2004 18:09 GMT

> Andrew has thrown down the gauntlet and nailed his
> colours to the mast with this swell in numbers. I can almost sense the
> bandwidth switching to http://www.physci.org/codes/sscce.jsp rather
> than http://mindprod.com/jgloss/errormessages.html .

..But then, Andrew has yet to get his act
together and add about 100 or so links to
Roedy's site, including links to many of the
'hidden' anchors in errormessages.html..

[ #32 on the 'Urgent - To-Do' list.. ]

I'm not sure whether you ever intend to put
an index of those anchors Roedy.. It'd be
nice to assume every exception listed could
be accessed like..

errormessages.html#NoClassDefFoundException

In fact, that'd almost make it too easy..

Nahhh.. stuff 'em. They can damn well
search the document themselves. ;-)

Now ..what was this thread about?

Oh yeah.. 'Possible Loss of Precision'..
I think what we have is
'Possible Loss of Thread'..

I hope you have got your answer sauron,
if not, don't mind our sidetracks, just
jump straight back in.. :-)

Signature

Andrew Thompson
http://www.PhySci.org/ Open-source software suite
http://www.PhySci.org/codes/ Web & IT Help
http://www.1point1C.org/ Science & Technology

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Roedy Green - 20 May 2004 18:46 GMT

>I'm not sure whether you ever intend to put
>an index of those anchors Roedy.

The exceptions have an obvious name, but the others I just have to
make up something. I have so far only made up names for the messages
I refer to often. I guess I could add anchors for everything to people
who want to link in.

One thing I find annoying is you have to view source to find out the
name of an anchor. It would be nice if you could just hover over some
text in the browser and get a link to it complete with nearest anchor.

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Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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Roedy Green - 20 May 2004 19:43 GMT

>I'm not sure whether you ever intend to put
>an index of those anchors Roedy.. It'd be
>nice to assume every exception listed could
>be accessed like..

I don't know about an index to the anchors, but I have added anchors
to everything A-T. U-Z to go.

In the process I consolidated duplicate entries that have crept in
over the years.

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Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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Roedy Green - 20 May 2004 22:20 GMT

>I'm not sure whether you ever intend to put
>an index of those anchors Roedy..

see http://mindprod.com/jgloss/errormessages.html#INDEX

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Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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Andrew Thompson - 21 May 2004 07:17 GMT

> see http://mindprod.com/jgloss/errormessages.html#INDEX

thnx!

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Ryan Stewart - 20 May 2004 18:09 GMT

> Anyway, what i'm interested in is how are you going to react to the
> advent of The Minion? Andrew has thrown down the gauntlet and nailed his
[quoted text clipped - 4 lines]
> I look forward to reading up on the battle at
> http://www.physci.org/secretweapons/the_minion.htm

Have you even looked at those pages? They're two completely different
things. And are you new here or what? I've been recommending that page for a
long time.

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Roedy Green - 20 May 2004 18:11 GMT

>It just seems quite funny (to me) to see you, Andrew and his minion
>posting links to your own sites (as if seeking publicity). I am fully
>aware of the good it does, but it doesn't mean I can't wind you up about it.

I find myself extremely angry with people like you. Not only do you
contribute little to the world, you belittle and impugn the motives of
those who try to.

You have no idea the huge black hole for time it is preparing the
materials on my website. I get no income from it. Ironically, I get
almost as many nasty cracks form lazy bounders like you who have so
such project of your own than I do pats on the back.

What are you trying to do, discourage me from providing this free
service?

I'm always open to suggestions for improvement, but blanket wet
blanket snarky remarks you can keep to yourself.

Signature

Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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John - 20 May 2004 19:16 GMT

>>It just seems quite funny (to me) to see you, Andrew and his minion
>>posting links to your own sites (as if seeking publicity). I am fully
[quoted text clipped - 3 lines]
> contribute little to the world, you belittle and impugn the motives of
> those who try to.

OK, I'll stop posting to this thread since you seem to be missing the
point. I explained (clearly) above that I think your site and
contribution is appreciated. Contribute little to the world? Maybe you
could substantiate that Roedy.

> You have no idea the huge black hole for time it is preparing the
> materials on my website.

"You must have put a few man-years into that site of yours" sound familiar

I get no income from it. Ironically, I get

> almost as many nasty cracks form lazy bounders like you who have so
> such project of your own than I do pats on the back.

Nasty? It's called a sense of humour. How do you know I don't have such
a project? Guess how many lines of source code I have online at the
moment for example.

> What are you trying to do, discourage me from providing this free
> service?

Read the post you replied to, please

> I'm always open to suggestions for improvement, but blanket wet
> blanket snarky remarks you can keep to yourself.

Unlike java, natural language can be interpreted several ways. Why don't
you recompile with sense of what is well-intentioned and what isn't?

<gives up>

John

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Alex Hunsley - 20 May 2004 20:16 GMT

>> I'm always open to suggestions for improvement, but blanket wet
>> blanket snarky remarks you can keep to yourself.
[quoted text clipped - 5 lines]
>
> John

Can I just chime in at this point to say: if in doubt,
#include "smiley.h". Humour via ascii is apt to be misunderstood if it's
not very obvious humour, and in retrospect I think the lack of a smiley
in your original post was an omission that didn't help things greatly.

alex

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John - 21 May 2004 09:34 GMT

>>> I'm always open to suggestions for improvement, but blanket wet
>>> blanket snarky remarks you can keep to yourself.
[quoted text clipped - 13 lines]
>
> alex

OK, I will now use :-) or <only_joking> </only_joking> in posts like
that. I was a bit reluctant before since I find that making such content
obvious detracts from its value. This is (with hindsight) preferable to
upsetting people, I have realised.

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Alex Hunsley - 21 May 2004 13:29 GMT

>>>> I'm always open to suggestions for improvement, but blanket wet
>>>> blanket snarky remarks you can keep to yourself.
[quoted text clipped - 19 lines]
> obvious detracts from its value. This is (with hindsight) preferable to
> upsetting people, I have realised.

thanks!
alex

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Roedy Green - 21 May 2004 17:15 GMT

>OK, I will now use :-) or <only_joking> </only_joking>

That does not really help. If the words are rude, the smiley is just
a way of hitting, and using a phony defense. Just stay away from
nasty cracks, especially about sacred cows. The Java glossary is one
of mine.

It is a variant of fighting in quotes.

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Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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Roedy Green - 21 May 2004 17:12 GMT

>Nasty? It's called a sense of humour

I did not read it that way. In person, your tone of voice could have
made it clear, but in print, it came across as rude.

Be careful using that sort of humour with strangers in newsgroups.
You can get away with it only once people get you know you and your
have a model of your beliefs.

Signature

Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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Mark Haase - 30 May 2004 01:53 GMT

> I did not read it that way. In person, your tone of voice could have
> made it clear, but in print, it came across as rude.

I read it as a joke that was poorly worded. No biggie.

|\/| /| |2 |<

mehaase(at)sas(dot)upenn(dot)edu

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Aki Laukkanen - 26 May 2004 09:05 GMT

>>It just seems quite funny (to me) to see you, Andrew and his minion
>>posting links to your own sites (as if seeking publicity). I am fully
[quoted text clipped - 14 lines]
> I'm always open to suggestions for improvement, but blanket wet
> blanket snarky remarks you can keep to yourself.

I'd have to concur with Roedy on this one.
He's done a great job helping us newbies out.
As far as I've seen, there's been no boasting on his part about his own
achievements.
There's no acceptable reason whatsoever to mock or slander someone who's
put a lot of time and effort in making a valuable resource to us newbie
programmers and never got a cent out of it. Not even if they bragged
about it, which Roedy does not.

Signature

-Aki "Sus" Laukkanen

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Shashank - 20 May 2004 14:01 GMT

If you can tell type of price

regards,
Shashank

> I got this error when writing a method.
>
[quoted text clipped - 5 lines]
>
> Can anyone tell me what this means?

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Alex Hunsley - 20 May 2004 14:04 GMT

> I got this error when writing a method.
>
[quoted text clipped - 5 lines]
>
> Can anyone tell me what this means?

The others have answered admirably. Just thought I'd say that your post itself
contains a certain lack of precision - i.e. post all the code if possible, and
the exact error message.... it will help others to answer you in the future.

alex

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Roedy Green - 20 May 2004 16:50 GMT

> public int getPrice(){
> return price;
> }

see http://mindprod.com/jgloss/errormessages.html

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Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

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