Help needed with VERY large numbers.

I am trying to write a program that does integer math on extremely large numbers.

Basically, I'm going to be multiplying two numbers in the range of 250 (decimal) digits together, and comparing the results to a much larger number (say 500 decimal digits). Based on the results of the comparison, one of the two initial numbers will be modified.

My question is, how would I set these extremely long numbers as variables? I know that a 1560bit number will not fit into a "long long". Anyone know of any libraries or anything that might help me with this?

Thanks!

Jeff

This was discussed recently...

So, search the board. (I didn't follow the discussion, so I don't know the details.)

There *are* libraries. You'd have to search the net.

You could write your own, if you want to do it as a learning exercise... imagine that you are using one of those mechanical counters to count the number of people entering a stadium. If the counter only goes up to 999, what do you do? Get two of them and use the second one to count how many times the first one rolls-over. (Your mathmatical operations require a bit more thinking.)

**[EDIT]**

I see Salem beat me to it... with a better, more specific answer! ... I was afraid you were going to get a rude "Search the freekin' board" answer. :)

BTW - I would *not* attempt to write my own BigInt library, unless I *really* wanted to. It could turn-out to be a bigger project, than the program that utilizes the library! It's almost always better to use a pre-existing library. (Of course, sometimes cost is a consideration too.)