On 2020-09-05 05:03, Paul Gilmartin wrote:
On Fri, 4 Sep 2020 17:10:36 +0000, Farley, Peter x23353 wrote:
Sounds to me like the documentation writer was a bit confused. Looks
to me like it should read instead:
If th nnumber 3.1416 is used in more than one place in the program,
then you *should* declare it as a named constant.
No. "Even "should" is too strong.
As I wrote earlier. "may" should have been used.
If it requires specific data or precision attributes at different
places in the program, then you *must* declare it as a named constant.
Yes. The first sentence discusses style and belongs in a Programmers
Guide.
It should just be removed from a Language Reference.
I haven't Enterprise PL/I. Can anyone supply a compiled
counterexample,
perhaps:
area = (radius**2) * 3.1416;
volume = (radius**3) * 4/3 * 3.1416;
...? I'll submit an RCF.
As for writing formulas, I prefer to follow a well-known formula, thus:
volume = 4/3 * 3.14159 * radius**3
However, if I'm interested in efficiency, I'd prefer
volume = 4 * 3.14159E0 / 3 * radius**3
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