>I need to calculate and store in a table some factorial numbers (n!) for n<=30.
>For elaboration performance I have to create a "factorial matrix".
>I made it using double fields. All work ok,for little number, but the value that is effectively stored and pheraps calculated isn't correct (exact) when they are expressed as exponential. Documentation says that double field precision is (+/-4.94065645841247E-324 to +/-8.9884656743115E307)
>30!= in my table is something like 2,6525285981219+E32 but I think that this value don't have enought decimail digits and of course isn't exact.
>If I'm not in wrong,how can I operate whit more decimal digits precision.
>
>Thanks in advance
>Enrico De Angelis

1) 15-16 significant digits, yes. No exact (integer) figure can be given, because data is stored internally as binary, not decimal.

2) I created a class that does math with almost unlimited precision. The class includes methods add(), subtract(), multiply(), divide(), exp(), sin(), greater(), less(), equal(), pi_access(), and several others more. I think I even included a factorial() method.

Since several people seem to be interested in "unlimited precision", I will post it soon on the UT.

In the meantime, if you need it urgently, send me an e-mail, and I will send you the class.

Please note that this sort of calculations are relatively slow in VFP.

Hilmar.