Re: calculation accuracy

On Mar 28, 2:33 pm, Thomas Koenig <Thomas.Koe...@xxxxxxxxx> wrote:
Richard Maine <nos...@xxxxxxxxxxxxx> wrote:
Yes. It seems sort of pointless to declare pi_d as double precision and
also properly specify the literal as double precision, but then give
only 8 digits of it. It isn't as though the compiler is going to be able
to guess "oh, that's close to pi, and the variable name has pi in it, so
maybe I should use a more accurate value of pi instead of the one
specified).

Can we have a standardized way to specify pi? Please?

Usually I don't use plain pi repeatedly in my code but 2*pi or sqrt(pi/
2) or ... . Should the committee standardize all of these? I use Paul
van Delst's "Fundamental Constants" for pi and related quantities. It
is part of his "Utility Source Code" at http://www.ssec.wisc.edu/~paulv/Fortran90/Utility/
..

.

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