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Groups > comp.lang.c++ > #70231
| From | Bo Persson <bo@bo-persson.se> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: What does the "L" mean |
| Date | 2019-12-04 10:08 +0100 |
| Message-ID | <h4pbc7Fhv1nU1@mid.individual.net> (permalink) |
| References | <qs7npd$5jn$1@dont-email.me> <qs7o3e$5mt$1@news.albasani.net> <qs7pcd$d9p$1@dont-email.me> <qs7rei$n8m$1@dont-email.me> <qs7sc6$rf7$1@dont-email.me> |
On 2019-12-04 at 09:56, T wrote:
> On 2019-12-04 00:40, Paavo Helde wrote:
>> On 4.12.2019 10:05, T wrote:
>>> On 2019-12-03 23:43, Bonita Montero wrote:
>>>> Am 04.12.2019 um 08:38 schrieb T:
>>>>> Hi All
>>>>> MB_ICONEXCLAMATION
>>>>> 0x00000030L
>>>>> What does the "L" at the end mean?
>>>>
>>>> It means that the integral literal is a long.
>>>
>>> 64 bit integer?
>>
>> Depends on the platform/implementation. In this case the constant is
>> from Windows headers, and in Windows/MSVC a long is 32-bit even in
>> 64-bit Windows.
>>
>> This is basically so because long happened to be 32-bit in 16-bit DOS
>> 35 years ago, and MS used it a lot instead of 16-bit int (which was
>> indeed unusable for many purposes). As a result, now they cannot
>> change 'long' to 64-bit because they have abused it so much.
>>
>
> Great explanation. Thank you!
>
> In Perl6 , we have:
>
> int8 (int8_t in C)
> int16 (int16_t in C)
> int32 (int32_t in C)
> int64 (int64_t in C)
>
> $ p6 'my int64 $x=0xF; say $x;'
> 15
>
> $ p6 'my int64 $x=0xFFFFFFFFFFFFFFF; say $x;'
> 1152921504606846975
>
> $ p6 'my int64 $x=0xFFFFFFFFFFFFFFFF; say $x;'
> Cannot unbox 64 bit wide bigint into native integer
> in block <unit> at -e line 1
>
>
Some languages historically also target more exotic hardware, so in C
(and C++) int and long are allowed be 36 bits instead of 16 and 32
https://stackoverflow.com/a/6972551
Bo Persson
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What does the "L" mean T <T@invalid.invalid> - 2019-12-03 23:38 -0800
Re: What does the "L" mean Bonita Montero <Bonita.Montero@gmail.com> - 2019-12-04 08:43 +0100
Re: What does the "L" mean T <T@invalid.invalid> - 2019-12-04 00:05 -0800
Re: What does the "L" mean Geoff <geoff@invalid.invalid> - 2019-12-04 00:32 -0800
Re: What does the "L" mean T <T@invalid.invalid> - 2019-12-04 00:33 -0800
Re: What does the "L" mean Paavo Helde <myfirstname@osa.pri.ee> - 2019-12-04 11:11 +0200
Re: What does the "L" mean Geoff <geoff@invalid.invalid> - 2019-12-04 01:14 -0800
Re: What does the "L" mean "Fred. Zwarts" <F.Zwarts@KVI.nl> - 2019-12-04 09:39 +0100
Re: What does the "L" mean T <T@invalid.invalid> - 2019-12-04 00:51 -0800
Re: What does the "L" mean Paavo Helde <myfirstname@osa.pri.ee> - 2019-12-04 10:40 +0200
Re: What does the "L" mean T <T@invalid.invalid> - 2019-12-04 00:56 -0800
Re: What does the "L" mean Bo Persson <bo@bo-persson.se> - 2019-12-04 10:08 +0100
Re: What does the "L" mean T <T@invalid.invalid> - 2019-12-04 01:20 -0800
Re: What does the "L" mean Vir Campestris <vir.campestris@invalid.invalid> - 2019-12-04 21:46 +0000
Re: What does the "L" mean Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-12-05 01:33 +0000
Re: What does the "L" mean Vir Campestris <vir.campestris@invalid.invalid> - 2019-12-05 15:15 +0000
Re: What does the "L" mean Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-12-05 15:31 +0000
Re: What does the "L" mean Vir Campestris <vir.campestris@invalid.invalid> - 2019-12-06 10:59 +0000
Re: What does the "L" mean Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-12-07 03:55 +0000
Re: What does the "L" mean James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-12-06 23:38 -0500
Re: What does the "L" mean Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-12-06 22:36 -0800
Re: What does the "L" mean Vir Campestris <vir.campestris@invalid.invalid> - 2019-12-08 21:33 +0000
Re: What does the "L" mean Bart <bc@freeuk.com> - 2019-12-06 20:44 +0000
Re: What does the "L" mean Bart <bc@freeuk.com> - 2019-12-06 20:52 +0000
Re: What does the "L" mean Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-12-06 22:20 -0800
Re: What does the "L" mean Bart <bc@freeuk.com> - 2019-12-06 16:20 +0000
Re: What does the "L" mean boltar@nowhere.co.uk - 2019-12-06 16:30 +0000
Re: What does the "L" mean Bart <bc@freeuk.com> - 2019-12-06 17:50 +0000
Re: What does the "L" mean scott@slp53.sl.home (Scott Lurndal) - 2019-12-06 18:18 +0000
Re: What does the "L" mean boltar@nowhere.co.uk - 2019-12-07 11:57 +0000
Re: What does the "L" mean Bart <bc@freeuk.com> - 2019-12-07 12:04 +0000
Re: What does the "L" mean boltar@nowhere.co.uk - 2019-12-07 13:05 +0000
Re: What does the "L" mean Bart <bc@freeuk.com> - 2019-12-07 13:16 +0000
Re: What does the "L" mean Öö Tiib <ootiib@hot.ee> - 2019-12-07 05:49 -0800
Re: What does the "L" mean scott@slp53.sl.home (Scott Lurndal) - 2019-12-06 16:36 +0000
Re: What does the "L" mean Bonita Montero <Bonita.Montero@gmail.com> - 2019-12-04 13:47 +0100
Re: What does the "L" mean Thiago Adams <thiago.adams@gmail.com> - 2019-12-04 04:57 -0800
Re: What does the "L" mean "Fred. Zwarts" <F.Zwarts@KVI.nl> - 2019-12-04 14:41 +0100
Re: What does the "L" mean Bonita Montero <Bonita.Montero@gmail.com> - 2019-12-04 15:06 +0100
Re: What does the "L" mean James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-12-04 08:55 -0500
Re: What does the "L" mean T <T@invalid.invalid> - 2019-12-04 00:34 -0800
Re: What does the "L" mean Keith Thompson <kst-u@mib.org> - 2019-12-04 08:28 -0800
Re: What does the "L" mean Robert Wessel <robertwessel2@yahoo.com> - 2019-12-05 09:32 -0600
Re: What does the "L" mean Keith Thompson <kst-u@mib.org> - 2019-12-05 10:03 -0800
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