>Why don't return error message or warning in VFP?

That I don't know - but as I said, why would anyone need 16 digits of precision? Char strings should be used for these normally, as most of us agreed.

If someone actually has an example where they need to do computations on 16 or more digits of accuracy, I would be interested to know what it is. I don't think you could get that high even using an "inflated" type of currency like Lira :)