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John Friedland
*nix forums beginner
Joined: 11 Jul 2006
Posts: 7
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 Posted: Fri Jul 21, 2006 9:26 am Post subject:
Does stream I/O support "%a" floating-point format?
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'printf' has a '%a' conversion for floating-point output:
| Quote: | The `%a' and `%A' conversions are meant for representing
floating-point numbers exactly in textual form so that they can be
exchanged as texts between different programs and/or machines. The
numbers are represented is the form [`-']`0x'H`.'HHH`p'[`+'|`-']DD.
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For example, printing '123456' with "|%13.4a|" produces
| 0x1.e240p+16|
I've looked through Josuttis and the header files, but I can't find
any flags or manipulators that could handle this. Is this possible
with stream I/O?
Supplementary question: does anyone know how to search for a '%a' in
Google groups?
Thanks -
John |
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Pete Becker
*nix forums Guru
Joined: 22 Feb 2005
Posts: 682
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| Posted: Fri Jul 21, 2006 11:13 am Post subject:
Re: Does stream I/O support "%a" floating-point format?
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John Friedland wrote:
| Quote: | 'printf' has a '%a' conversion for floating-point output:
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The %a and %A conversion specifiers are new in C99. C++ is based on C90,
so as it stands now, it doesn't have them. TR1 adds them, and that's one
of the parts of TR1 that's been added to the working draft for the next
version of the C++ standard.
But in practice, if your C library supports them, they'll work in C++, too. |
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P.J. Plauger
*nix forums Guru
Joined: 16 May 2005
Posts: 365
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| Posted: Fri Jul 21, 2006 11:52 am Post subject:
Re: Does stream I/O support "%a" floating-point format?
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"Pete Becker" <petebecker@acm.org> wrote in message
news:Jradnc6FS5RsK13ZnZ2dnUVZ_rudnZ2d@giganews.com...
| Quote: | John Friedland wrote:
'printf' has a '%a' conversion for floating-point output:
The %a and %A conversion specifiers are new in C99. C++ is based on C90,
so as it stands now, it doesn't have them. TR1 adds them, and that's one
of the parts of TR1 that's been added to the working draft for the next
version of the C++ standard.
But in practice, if your C library supports them, they'll work in C++,
too.
|
Right. Our current product, which includes full TR1 support, also provides
the manipulator hexfloat, so you can insert hexadecimal format
floating-point
values into a stream. As Pete says, both %a in printf and hexfloat in
iostreams are part of TR1 and will be part of the next C++ Standard.
P.J. Plauger
Dinkumware, Ltd.
http://www.dinkumware.com |
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P.J. Plauger
*nix forums Guru
Joined: 16 May 2005
Posts: 365
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| Posted: Fri Jul 21, 2006 11:53 am Post subject:
Re: Does stream I/O support "%a" floating-point format?
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"Pete Becker" <petebecker@acm.org> wrote in message
news:Jradnc6FS5RsK13ZnZ2dnUVZ_rudnZ2d@giganews.com...
| Quote: | John Friedland wrote:
'printf' has a '%a' conversion for floating-point output:
The %a and %A conversion specifiers are new in C99. C++ is based on C90,
so as it stands now, it doesn't have them. TR1 adds them, and that's one
of the parts of TR1 that's been added to the working draft for the next
version of the C++ standard.
But in practice, if your C library supports them, they'll work in C++,
too.
|
Right. Our current product, which includes full TR1 support, also provides
the manipulator hexfloat, so you can insert hexadecimal format
floating-point
values into a stream. As Pete says, both %a in printf and hexfloat in
iostreams are part of TR1 and will be part of the next C++ Standard.
P.J. Plauger
Dinkumware, Ltd.
http://www.dinkumware.com |
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