Hi all... How can I find out the number of significant digits (to the
right of the decimal place, that is) in a double? At least, I *think*
that's what I'm asking for. For instance:
0.103 --> 3
0.0103 --> 4
0.00103 --> 5
0.000103 --> 6
0.0000103 --> 7
Thanks in advance!
--Steve (mrstephengr... @hotmail.com)
3  2500 
mrstephengross wrote: Hi all... How can I find out the number of significant digits (to the
right of the decimal place, that is) in a double? At least, I *think*
that's what I'm asking for. For instance:
0.103 --> 3
0.0103 --> 4
0.00103 --> 5
0.000103 --> 6
0.0000103 --> 7
Actually, from what I remember, all numbers you have here have the same
number of significant digits: 3, the leading (and trailing) zeros do not
count as significant.
And then there is no such thing as "significan t digits" in a double. What
may appear as 0.0103 to you (in the output), in fact is probably something
like 0.0102999999999 99998 in the computer. IOW, all digits (16 or so) are
significant in a 'double'.
V
>What may appear as 0.0103 to you (in the output), in fact is probably
something
like 0.0102999999999 99998 in the computer. IOW, all digits (16 or so)
are
significant in a 'double'.
Darn! I suspected this was the case...
--Steve
Victor Bazarov wrote: mrstephengross wrote:
Hi all... How can I find out the number of significant digits (to the
right of the decimal place, that is) in a double? At least, I *think*
that's what I'm asking for. For instance:
0.103 --> 3
0.0103 --> 4
0.00103 --> 5
0.000103 --> 6
0.0000103 --> 7
Actually, from what I remember, all numbers you have here have the same
number of significant digits: 3, the leading (and trailing) zeros do not
count as significant.
Mostly true, except that trailing zeros may be significant. Universally
(I believe) 0.103000 is regarded as having 6 significant digits. For
trailing zeros to the left of the decimal point it's ambiguous. 103000
may have from 3 to 6 significant digits. According to one convention,
one uses an overbar in such cases to mark the least significant digit. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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last post by:
Hi all... How can I find out the number of significant digits (to the
right of the decimal place, that is) in a double? At least, I *think*
that's what I'm asking for. For instance:
0.103 --> 3
0.0103 --> 4
0.00103 --> 5
0.000103 --> 6
0.0000103 --> 7
|
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