How to detect a double's significant digits

[Grant Edwards]

On 2005-05-05, Erik Max Francis <max at alcyone.com> wrote:

> Especially since all of his examples have the same number of
> significant digits (3), as the term is usually meant.  Zeroes
> to the right are significant, not zeroes to the left.

And only the person who performed the measurement knows how
many of the zeros to the right are significant.

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