large numbers

I am sure this has been asked before but I was unable to find it. I am working on a math program and figured hey lets use c++ everything is great until I start programing for factorials. Well in short does anyone know of a library or package for dev C++ or .net that allows me to have integers greater then the oh so high long int. If not does anyone know how to get unsigned int 32 to work with the % fuction. But that still will only cover me for a bit I really could use a library that has all the functions that a long int would have just i need it to float.

Thanks in advance,
starripper

If you want really big numbers, use a library
http://www.swox.com/gmp/

BTW, there is no problem with % on any integer types.

Thanks for the link I will give this a shot. I think my % not working with unsigned has something to do with my compiler not letting me include system but not to sure.

Unless you post your code, and appropriate error messages, sample values, results (expected or otherwise), it's hard to say what's going on.

% is a built-in operator, just like +.
Post your code.

Maybe you're using % on a floating point type, like this?

Code:

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double x = 4, y = x % 3;

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If so, you can use the function fmod() instead.