| Re: unsigned long long and min/max operator [message #59248] |
Thu, 13 March 2008 13:03 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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R.G. Stockwell writes:
> They probably figured no one would notice.
> I mean, come on, who needs a number that large?
I was trying to write a number like that for the
hard drive spec sheet I was writing for the next
computer I want to buy. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: unsigned long long and min/max operator [message #59249 is a reply to message #59248] |
Thu, 13 March 2008 12:22  |
R.G. Stockwell
Messages: 363
Registered: July 1999
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Senior Member |
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"Jean H" <jghasban@DELTHIS.ucalgary.ANDTHIS.ca> wrote in message
news:frbiev$mql$1@news.ucalgary.ca...
>> I must have OCD or something, but here is where it fails.
>>
>> IDL> print, 1ull > 9223372036854775807ull
>> 9223372036854775807
>> IDL> print, 1ull > 9223372036854775808ull
>> 1
>>
>>
>> 9223372036854775808 is 2^63
>> OS STRING 'Win32'
>
> ... that is also the maximum long 64 value + 1 (= -9223372036854775808)
> ... as if IDL would not make a difference between LL and ULL...
They probably figured no one would notice.
I mean, come on, who needs a number that large?
:)
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| Re: unsigned long long and min/max operator [message #59255 is a reply to message #59249] |
Thu, 13 March 2008 08:49 |
Jean H.
Messages: 472
Registered: July 2006
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Senior Member |
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> I must have OCD or something, but here is where it fails.
>
> IDL> print, 1ull > 9223372036854775807ull
> 9223372036854775807
> IDL> print, 1ull > 9223372036854775808ull
> 1
>
>
> 9223372036854775808 is 2^63
> OS STRING 'Win32'
... that is also the maximum long 64 value + 1 (= -9223372036854775808)
... as if IDL would not make a difference between LL and ULL...
Jean
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| Re: unsigned long long and min/max operator [message #59261 is a reply to message #59255] |
Wed, 12 March 2008 17:21 |
R.G. Stockwell
Messages: 363
Registered: July 1999
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Senior Member |
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"F�LDY Lajos" <foldy@rmki.kfki.hu> wrote in message
news:Pine.LNX.4.64.0803122110040.851@bifur.rmki.kfki.hu...
> Hi guys,
>
> IDL Version 7.0 (linux x86_64 m64):
>
> IDL> print, 1ull < 18446744073709551615ull ; minimum
> 18446744073709551615
> IDL>
> IDL> print, 1ull > 18446744073709551615ull ; maximum
> 1
>
> Ouch!
>
> regards,
> lajos
I must have OCD or something, but here is where it fails.
IDL> print, 1ull > 9223372036854775807ull
9223372036854775807
IDL> print, 1ull > 9223372036854775808ull
1
9223372036854775808 is 2^63
IDL> help,!version,/st
** Structure !VERSION, 8 tags, length=76, data length=76:
ARCH STRING 'x86'
OS STRING 'Win32'
OS_FAMILY STRING 'Windows'
OS_NAME STRING 'Microsoft Windows'
RELEASE STRING '6.3'
BUILD_DATE STRING 'Mar 23 2006'
MEMORY_BITS INT 32
FILE_OFFSET_BITS
INT 64
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| Re: unsigned long long and min/max operator [message #59263 is a reply to message #59261] |
Wed, 12 March 2008 14:13 |
Vince Hradil
Messages: 574
Registered: December 1999
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Senior Member |
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On Mar 12, 3:25 pm, FÖLDY Lajos <fo...@rmki.kfki.hu> wrote:
> Hi guys,
>
> IDL Version 7.0 (linux x86_64 m64):
>
> IDL> print, 1ull < 18446744073709551615ull ; minimum
> 18446744073709551615
> IDL>
> IDL> print, 1ull > 18446744073709551615ull ; maximum
> 1
>
> Ouch!
>
> regards,
> lajos
FWIW - Same results in IDL 6.3 (Solaris)
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| Re: unsigned long long and min/max operator [message #59264 is a reply to message #59263] |
Wed, 12 March 2008 13:34 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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=?ISO-8859-2?Q?F=D6LDY_Lajos?= writes:
> IDL Version 7.0 (linux x86_64 m64):
>
> IDL> print, 1ull < 18446744073709551615ull ; minimum
> 18446744073709551615
> IDL>
> IDL> print, 1ull > 18446744073709551615ull ; maximum
> 1
>
> Ouch!
At least there is an easy work-around: just stand on
your head! :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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