>>>>>Check "Visual FoxPro System Capacities" in Help. I guess the computations up to 15 digits can give the correct numbers.
>>>>
>>>>Sure, the numbers Fabio showed are beyond the system capabilities. But the point is, some of them give error messages, and some give only seemingly random results, without indicating, with any error, that something went wrong. Nothing you can trap with TRY for example.
>>>
>>>Right, I understood it - that's why I proposed to use numeric 20 instead and use a transform function.
>>
>>numeric() is a fake.
>>It uses float64, with the 15 digits limit.
>>
>>

>>? CAST("22919090710007290" as N(20))=CAST("22919090710007299" as N(20))
>>

>
>Too bad :(((

If you are not yet convinced

CLEAR

CREATE CURSOR ab (xx N(19))
APPEND BLANK
replace xx WITH 12345678901234560
FOR k=1 TO 10000
	replace xx WITH xx+9    && try to add 10 ...
NEXT
? xx && xx stands still