35 replies to this topic

[Hamed]

I want to have 65536! (factorial)
but I can not do it with double and long.
How can I have it in numeric view?


(How can I have 14!/6555! two?)

Edited by Hamed, 22 November 2010 - 08:06 AM.

[LuthfiHakim]

Use record or array and few routines to do basic calculations and format conversion (for such large numbers, i think you only need to string or from string conversions :) ). They do it all the time with Asymetrical encryption, for example RSA 256 bit, you need 256 bit (32 bytes) integer which I believe is not natively available in any language.

[Edit: addition]Or you can use strings for as mediator, although I don't really like it but I have seen it implemented this way.

Edited by LuthfiHakim, 19 November 2010 - 08:25 AM.
Add new alternative

[WingedPanther]

GMP is very useful. Basically, you need to use a struct/class to represent it.

[Hamed]

How can I use GMP?
Where can I download it?
I am using Dev-C++ now after installing GMP I get these error when I want to compile?

Attached Files

•  Untitled..png   2.63K   20 downloads

Edited by Hamed, 19 November 2010 - 10:30 AM.

[WingedPanther]

You may have to run ./configure and make to build it.

[Hamed]

How to run ./configure ?
I am new to Dev-C++.

[WingedPanther]

You may have to download sysdev from the MinGW tools. Also, Dev-C++ comes with a very old version of the MinGW compiler. You should at least upgrade to wxDev-C++

[mebob]

WingedPanther is right about Dev-C++ coming with a really old version of MinGW. I would suggest a different IDE, such as Code::Blocks, but that is up to you.
As for running the configure shell script, you would want to download MSYS for MinGW. It is basically a shell for MinGW. Here is a link for download and installation directions: MSYS | MinGW

[Hamed]

codeblocks-10.05mingw-setup.exe
I download this version and please guide me to use for GMP.

Does codeblocks has integrated compiler?

I have VC.Net 2008 but I don't know how to install GMP in VC.net.

[Hamed]

In CodeBlock I get this error:
"hg - Debug" uses an invalid compiler. Probably the toolchain path within the compiler options is not setup correctly?! Skipping...
Nothing to be done.
When I want to compile simple projects.

[mebob]

Make sure the compiler options points to the right MinGW path. MinGW is probably in the root of your main drive, unless you told the installer to put it elsewhere.

You can also have Code::Blocks use your VC++ compiler if you want it to.

[Hamed]

This my config!
I have MinGW in c drive but I can not use it!!!
Where can I change MinGW address?

Attached Files

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