That's obfuscation.
If it's in a loop, I'd expect the compiler to move the constant part outside
of the loop,
or to evaluate the constant part at compilation time.
In any case, the more efficient form eliminates the division 4/3,
avoiding the avaluation in fixed-point form (and the conversion
to floating-point).
----- Original Message -----
From: "Bob Bridges" <robhbrid...@gmail.com>
Newsgroups: bit.listserv.ibm-main
To: <IBM-MAIN@LISTSERV.UA.EDU>
Sent: Sunday, September 06, 2020 6:18 AM
Subject: Re: Constant Identifiers
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 */
---
Bob Bridges, robhbrid...@gmail.com, cell 336 382-7313
/* Things may come to those who wait, but only those things left behind by
those who hustle. -attributed (probably falsely) to Abraham Lincoln, lawyer
*/
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
Behalf Of Robin Vowels
Sent: Friday, September 4, 2020 18:14
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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