On Tue, Jun 08, 2021 at 11:42:46AM +0300, Jarkko Nikula wrote:

On 6/7/21 10:09 PM, Joe Perches wrote:

quoted

On Mon, 2021-06-07 at 18:23 +0300, Andy Shevchenko wrote:

quoted

+#define HECTO 100L
+#define DECA 10L

Should it be DECA or DEKA or both?

https://www.nist.gov/pml/weights-and-measures/metric-si-prefixes
deka Example: dekameter da 	10**1 	Ten

quoted

+#define DECI	10L
+#define CENTI	100L
+#define MILLI	1000L
+#define MICRO	1000000L
+#define NANO	1000000000L
+#define PICO	1000000000000LL
+#define FEMTO	1000000000000000LL

IMO: Might as well include all the prefixes up to 10**24

EXA ZETTA YOTTA, ATTA ZEPTO YOCTO

And how do people avoid using MILLI for KILO, MEGA for MICRO, etc...
The compiler won't care but usage could look odd.
I find this patch creates more confusion than solves a real problem

(typo where one zero is missing or one extra) and adds potentially needless
churn. For instance I don't assume much use for the HECTO now or in the
future.

How about if absolutely necessary just adding only KILO, MEGA and GIGA and
questionable defines only after when the real needs arises and can see does
"1/1000L" etc define cause any troubles to real calculations?

You are probably looking to the I2C codebase, while I based my choice on other
sightings. I agree about the usage count for DECI/CENTI et al., but having them
defined targets at least the following:

 1) occupies namespace so if we need them in the future there will be no
    ambiguity;
 2) provides a name for multipliers for the code to read and understand the
    semantics better.

-- 
With Best Regards,
Andy Shevchenko