Help locate an ideal large number class

[simpleid]

I'm looking for something that is identical to EXTNUM, only I can't find a download for it. Anyone know of alternative that will give me the same kind of number? (or can you do a better of searching than I have :-)

I'm not focusing on speed, I only need to use the number to view a change over time during testing.

The number would be the size of INT_MAX with the same mantissa as FLOAT (or DOUBLE), the accuracy is only really important to the degree of a FLOAT though.

Thanks!

[laserlight]

Would the GMP suffice?

[simpleid]

Yea, that's great thanks!