64 bits integer - ERRATA

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 <[email protected]>
Para: linux-c-programming <[email protected]>

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

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 <[email protected]>