64 bits integer - ERRATA

64 bits integer - ERRATA

[Luciano Moreira - igLnx]

Excuse me, when I say "64 bits", I m assuming that the OS are running 
under a processor with 32 bits only,  where "long" type ll have only 32 
bits and "double" could has 64 bits, but it isn't a integer, in other 
hands, I couldn't convert a double to a text string assuming that it is 
integer with a function like printf().

Then, retrying the question:
Does exist a way or some system call or another thing in Linux that 
allow us to manipulate integer values larger than a system DWORD (long) ?
Samples:
- int64, atoi64(), i64toa(), ...
- int128, atoi128(), i128toa(), ...

Luciano


-------- Mensagem Original --------
Assunto: 	64 bits integer
Data: 	Tue, 09 Nov 2004 22:30:57 -0300
De: 	Luciano Moreira - igLnx <lucianolnx@ig.com.br>
Para: 	linux-c-programming <linux-c-programming@vger.kernel.org>


How can we do to manipulate integer higher than 32 bits in linux ?

Does exist some system call (or another library), that allow us to do 
something like as following ?

int64 x;
x = atoi64("12345678901234567890");

char x[21];
i64toa(x, sizeof(x));

Thanks,

Luciano

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Re: 64 bits integer - ERRATA

[glynn]

Luciano Moreira - igLnx wrote:

> Excuse me, when I say "64 bits", I m assuming that the OS are running 
> under a processor with 32 bits only,  where "long" type ll have only 32 
> bits and "double" could has 64 bits, but it isn't a integer, in other 
> hands, I couldn't convert a double to a text string assuming that it is 
> integer with a function like printf().

As Mikael said, the "long long" type has 64 bits, even on a 32-bit
architecture such as x86.

> Then, retrying the question:
> Does exist a way or some system call or another thing in Linux that 
> allow us to manipulate integer values larger than a system DWORD (long) ?
> Samples:
> - int64, atoi64(), i64toa(), ...
> - int128, atoi128(), i128toa(), ...

strtoull will parse a 64-bit integer, while printf("%lld", ...) will
convert one to a string.

If you want to use integers larger than 64 bits, look into libmp
and/or libgmp.

-- 
Glynn Clements <glynn@gclements.plus.com>