How to detect a double's significant digits

[Grant Edwards]

On 2005-05-05, Jeremy Bowers <jerf at jerf.org> wrote:

> Since I think he mentioned something about predicting how much
> space it will take to print out, my suggestion is to run
> through whatever printing routines there are and get a string
> out,

A step which will require him to tell the printing routine how
many digits he wants printed.

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