>Thus spake Andrew Warren (fastfwd@IX.NETCOM.COM):
>
>     File-register REG contains a number between 0 and 127, inclusive.
>     The W-register contains a number between 0 and 127, inclusive.
>
>     Write the most efficient PIC16C54 program that you can, using as
>     few additional file registers as possible, to calculate:
>
>         (REG xor W) + 2 * (REG and W)
>

Isn't this just another way of writing REG + W.

REG xor W adds the bits with no carry, then 2 * REG and W adds in the carry!!

Keith.
==========================================================
Keith Dowsett         "Variables won't; constants aren't."

E-mail: kdowsett@rpms.ac.uk
WWW:    http://kd.rpms.ac.uk/index.html