Writing Rexx for myself (therefore no local standards to follow) I had to
set an internal boolean in a few places.
So I started it with
TRUE = (1=1)
FALSE = \TRUE
That's partly because I couldn't find doc on Rexx standards (no WWW yet)
and I didn't like to assume that 1 and 0 were always valid :-)
Roo
On Sat., Sep. 5, 2020, 22:48 Paul Gilmartin, <
0000000433f07816-dmarc-requ...@listserv.ua.edu> wrote:
> On Sat, 5 Sep 2020 16:09:32 -0400, Bob Bridges wrote:
> >
> > str=word('true false',(0-fx)+2)
> >
> >...where fx is Boolean.
> >
> My use of COPIES() was to save 2 lines of code while knowing that
> the function call/return overhead is large and IF would perform better.
>
> > if fx then str='true'; else str=true
> >
> ??? So if fx is 1 this sets str to "true"; if fx is 0 this sets str to
> "TRUE"?
>
> But I'd rather do:
> parse value 0 1 with false true.
> Or perhaps mischievously:
> parse value (2+2=5) (2+2=4) with false true .
>
> ... and have useful(?) constant identifiers. But I can think of
> few places other than function arguments where using Boolean
> constant identifiers improves either performance or legibility.
>
>
> On Sat, 5 Sep 2020 16:18:47 -0400, Bob Bridges wrote:
> >
> >When you care about efficiency, I'd think this would be better:
> >
> > const=4/3*3.14159E0 /* in the initialization */
> > volume=const*radius**3 /* inside the loop */
> >
> I leave it to the compiler to perform that sort of constant
> folding. Most of them do. Same for reordering operands.
> A programmer computing volumes in several places might
> declare a function (which the compiler should expand inline.)
>
>
> On Sat, 5 Sep 2020 16:21:51 -0400, Bob Bridges wrote:
> >
> >Going back to the beginning, Gil: SQRT(X**TWO+Y**TWO) looks like
> ~exactly~ the sort of thing that oughta be made a constant rather than
> being coded more than once. That is, if X, Y and TWO all constants
> themselves; and if they are not then this isn't an example of what you're
> talking about. Did you accidentally reverse your meaning? Or what am I
> missing?
> >
> No. I was assuming that X and Y are variables, perhaps function
> arguments and playing off the Lang. Ref's assertion (almost surely
> wrong, but I can't test it) that any constant (such as 2) occurring
> more than once *must* be declared and referenced as an identifier.
>
> >---
> >/* Anarchy might be great, if only it could be enforced. -Joseph Sobran,
> 2001-03-27 */
> >
> A couple decades ago I saw signs spray-painted on pavements and
> walls touting the Boulder Anarchist Party. I thought that Anarchists
> shouldn't have political parties. But how could that be enforced?
>
> -- gil
>
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