[squeak-dev] Rounding to n significant digits?

David T. Lewis lewis at mail.msen.com
Thu Aug 4 12:20:07 UTC 2011

On Thu, Aug 04, 2011 at 11:20:41AM +0200, Bert Freudenberg wrote:
> Hi,
> I'd like to print decimal Floats with at most n significant digits. E.g.
> 	123456 roundToSignificantDigits: 3
> 	=> 123000
> 	0.00123456 roundToSignificantDigits: 3
> 	=> 0.00123
> Would this generally be useful? If so, what would a good selector be? And what a good implementation? Instead of rounding I'd be happy to just get a String.

IMO, if it isn't considered useful, then it *should* be ;) Having grown
up with slide rules, I'm always annoyed by display of numbers with more
precision than is physically possible or computationally meaningful.
So +1 from me.

Answering a String seems good, because the typical use case would
be to display a number to some number of significant digits, but
not to change the value of the number itself.


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