Sorry for beeing ignorant - I'm a beginner.
I use Microsoft Visual C++, version 6.0.
A variable of type 'long integer' can store values no more than 2.1 bln.
However, I'd like to work with a substantially higher numbers, say,
consisting of 30 - 40 digits (just trying to develope some primitive
approach to RSA-problem).
Please advise me if there any methods or programming tricks to resolve
the problem.
Thank you. Sincerely,
Victor Goban. vg****@verizon.net
August 18, 2004. 5  2515 
victor goban <vg****@verizon.net> wrote: Sorry for beeing ignorant - I'm a beginner.
I use Microsoft Visual C++, version 6.0.
A variable of type 'long integer' can store values no more than 2.1 bln.
However, I'd like to work with a substantially higher numbers, say,
consisting of 30 - 40 digits (just trying to develope some primitive
approach to RSA-problem).
Please advise me if there any methods or programming tricks to resolve
the problem.
It's a bit off topic since it doesn't deal with the C++ Standard in
any way.. but the language itself cannot handle numbers larger than
that as that is all the registers in your CPU can handle. You would
probably want to consider either writing your own "BigInt" class to
handle such values, or Google up a BigInt class/library already written.
--
Kristofer Pettijohn kr*******@cybernetik.net
On 19 Aug 2004 01:04:15 GMT in comp.lang.c++, kr*******@cybernetik.net
(Kristofer Pettijohn) wrote, .. but the language itself cannot handle numbers larger than
that as that is all the registers in your CPU can handle.
Nonsense. A conforming C++ compiler must generate code to handle
numbers larger than the CPU registers, if those registers are smaller
than 32 bits. Meanwhile, compilers implementing 64bit types on 32bit
CPUs are becoming common, e.g http://www.digitalmars.com
"victor goban" <vg****@verizon.net> schrieb im Newsbeitrag
news:kcSUc.21791$iE3.13780@trndny09... Sorry for beeing ignorant - I'm a beginner.
I use Microsoft Visual C++, version 6.0.
A variable of type 'long integer' can store values no more than 2.1 bln.
However, I'd like to work with a substantially higher numbers, say,
consisting of 30 - 40 digits (just trying to develope some primitive
approach to RSA-problem).
Please advise me if there any methods or programming tricks to
resolve the problem.
Thank you. Sincerely,
Victor Goban.
vg****@verizon.net
August 18, 2004.
With MSVC 6.0 you could also use the
Microsoft specific __int64 type.
On Thu, 19 Aug 2004 08:15:20 +0200, "Friedrich Neurauter"
<fr*****************@eunet.at> wrote:
"victor goban" <vg****@verizon.net> schrieb im Newsbeitrag
news:kcSUc.21791$iE3.13780@trndny09... Sorry for beeing ignorant - I'm a beginner.
I use Microsoft Visual C++, version 6.0.
A variable of type 'long integer' can store values no more than 2.1 bln.
However, I'd like to work with a substantially higher numbers, say,
consisting of 30 - 40 digits (just trying to develope some primitive
approach to RSA-problem).
Please advise me if there any methods or programming tricks to
resolve the problem.
Thank you. Sincerely,
Victor Goban.
vg****@verizon.net
August 18, 2004.
With MSVC 6.0 you could also use the
Microsoft specific __int64 type.
Some other compilers use long long int for 64 bit integers, but again
this is an extension to the standard and not portable.
As you are a beginner, it might be worthwhile writing your own big
integer class as a learning exercise.
rossum
--
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