wang shuming wrote:
Hi,
select 9000000000000.10*19.80 wrong result 178200000000001.97
if <= 900000000000.10*19.80 right result 17820000000001.98
This is very typical floating point error. Computers don't have
infinite precision or it would take infinite time to compute the
answer. I have to ask why you need such precise number. In the real
world if you can measure or control something to 4 significant digits
you are doing really good. If you can do 6 you are doing great. If you
can do 8 you are one step from a miracle worker. Measuring or
controlling something to a level of precision of 16 significant digits
is completely impossible.
--
Chris W
KE5GIX
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