Hey! I am currently just fooling around with prime numbers in C++ and I was wondering if anyone knows of any variables or an SDK or class that I can use that allows me to use numbers of unlimitied length? Currently, I am using unsigned longs. Thanks, Voytek

There are several arbitrary precision arithmetic libraries available, for example the
GNU MP library.

class CSuperInteger
{
public:
unsigned long[2];
//add operation overwrites here and check if it exceeds the 64 bits of the long if so switch the rest of the bits to the second long
add a text output function that converts it to characters so you are able to print it
char *GiveText();
};


provided you know how to use the binary system

QWORD?

Depending on your system, you may be able to use (non-portable) data types that are larger than 64 bits (if you have VC++, for instance, you should be able to use an _int64 type for 64-bit integers). Of course, for a math application, you might simply want to use an unlimited precision library, as spock suggested.

quote:

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Original post by Miserable
Depending on your system, you may be able to use (non-portable) data types that are larger than 64 bits (if you have VC++, for instance, you should be able to use an _int64 type for 64-bit integers). Of course, for a math application, you might simply want to use an unlimited precision library, as spock suggested.

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in vc++ it''s __int64 (2 underscores)

Hey!
I am making this a DOS application, so I am using iostream.h, and I was wondering if there is any way to input a __int64? cin>> does not work.
Thanks for all the help.
-Voytek

Overload your own stream operator. Then read it from the stream as a string and then convert it to the big integer...

Converting strings to a integer is a fairly simple process.



-SniperBoB-

What if The Matrix was recursive?

http://www.apfloat.org/apfloat/2.35/

this is very good free aplib. It supports integers, modular integers, floats and complex numbers.

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Dave