OpenEuphoria

Re: No xor!!!

• Posted by "Carl R. White" <C.R.White at SCM.BRAD.AC.UK> Oct 27, 1998
• 662 views

On Mon, 26 Oct 1998, Matt Z Nunyabidness wrote:

> Why is there no xor operator, imp, or eqv? How do you xor stuff if you
> don't have it???

I assume you want to do things like:

    if a = 3 xor b = 4 then...

Easy. Just do this instead (note the brackets. They *have* to be there to
use this trick):

    if (a = 3) != (b = 3) then...
              ^^^^-xor is bitwise inequality
For eqv:

    if (a = 3) = (b = 4) then...
              ^^^-eqv is bitwise EQuiValence

For imp:

    if (a = 3) or not (b = 4) then...
              ^^^^^^^^-imp is logical IMPlication (not obvious here)

If you're not wanting logical expressions, but bitwise operations,
Euphorias 1.5+ have the functions

and_bits(), or_bits() and xor_bits().

There may be some old libraries out there that emulate these using
int_to_bits(), bits_to_int(), and "not", "and" and "or".

HTH,
Carl

--
Carl R White -- Final Year Computer Science at the University of Bradford
E-mail...: cyrek- at -bigfoot.com -- Remove the hyphens before mailing. Ta :)
URL......: http://www.bigfoot.com/~cyrek/
Ykk rnyllaqur rgiokc cea nyemdok ymc giququezka caysgr -- B.Q.Vgesa