Re: Hi byte and Lo Byte Question

[Mark Johnson <mark_h_johnson@raytheon.com>]

Darren New wrote:

> > #define LOBYTE(Value) (Value&0xff)
> > #define HIBYTE(Value) (Value >>8)
>
> Why not (value % 256) and (value / 256)? Or the Ada equivalent?
>

They work, along with several others. I picked the ones w/ mask & shifts
because older compilers tend to generate good code for them [the
examples you provide require the compiler to detect division by a power
of two and convert...].

[OT] As a side note, there was a pretty interesting discussion on the
Linux kernel mailing list about min & max & the new "incompatible"
version that requires the data type to do the comparison. Apparently
this came from the discovery of several independent definitions of the
min & max functions [sigh]. NIH lives on.
  --Mark