dillon@HERMES.BERKELEY.EDU (Matt Dillon) (04/22/89)
bitmap's A and B A = A ^ B B = B ^ A (B = B ^ A ^ B = A) A = A ^ B (A = A ^ B ^ A = B) -Matt
bryan@cs.utexas.edu (Bryan Bayerdorffer @ Wit's End) (04/22/89)
In article <8904212115.AA19128@hermes.berkeley.edu> dillon@HERMES.BERKELEY.EDU (Matt Dillon) writes: =- =- bitmap's A and B =- =- A = A ^ B =- B = B ^ A (B = B ^ A ^ B = A) =- A = A ^ B (A = A ^ B ^ A = B) =- =- -Matt Or (Xor?), for that matter, A = A xor B B = A xor B A = A xor B Now let's all recite swap() {a = a+b; b = a-b; a = a-b;} for the zillionth time. :-) :-) ______________________________________________________________________________ /_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/_____/ |_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____| _No dark sarcasm in the classroom|_____|_____|_____|_____|_____|_____|_____|___ |____Teachers leave the kids alone__|_____|_____|_____|_bryan@cs.utexas.edu___| ___|_____|_____|_____|_____|_____|_____|{vertebrae...}!cs.utexas.edu!bryan_|___ |_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|
dillon@POSTGRES.BERKELEY.EDU (Matt Dillon) (04/25/89)
Uh, we just said the same thing.... '^' *is* an xor.
-Matt
:In article <8904212115.AA19128@hermes.berkeley.edu> dillon@HERMES.BERKELEY.EDU (Matt Dillon) writes:
:=-
:=- bitmap's A and B
:=-
:=- A = A ^ B
:=- B = B ^ A (B = B ^ A ^ B = A)
:=- A = A ^ B (A = A ^ B ^ A = B)
:=-
:=- -Matt
:
: Or (Xor?), for that matter,
:
: A = A xor B
: B = A xor B
: A = A xor Bewhac@well.UUCP (Leo 'Bols Ewhac' Schwab) (04/26/89)
In article <8904212115.AA19128@hermes.berkeley.edu> dillon@HERMES.BERKELEY.EDU (Matt Dillon) writes: > bitmap's A and B > > A = A ^ B > B = B ^ A (B = B ^ A ^ B = A) > A = A ^ B (A = A ^ B ^ A = B) > Gee, Matt, did you just discover this? Even I knew about this one. Of course, it had to be spelled out to me... _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ Leo L. Schwab -- The Guy in The Cape INET: well!ewhac@ucbvax.Berkeley.EDU \_ -_ Recumbent Bikes: UUCP: pacbell > !{well,unicom}!ewhac O----^o The Only Way To Fly. hplabs / (pronounced "AE-wack") "Work FOR? I don't work FOR anybody! I'm just having fun." -- The Doctor
jimm@amiga.UUCP (Jim Mackraz) (05/02/89)
--
I've just caught the end of this thread, but I want to say two things:
1- I actually got this question on an interview once.
2- layers.library/SwapBitsRastPortClipRect(), page A-175 of blue RKM.
jimm
--
Jim Mackraz, I and I Computing "He's hidden now, but you can see
{cbmvax,well,oliveb}!amiga!jimm The bubbles where he breathes."
- Shriekback
Opinions are my own. Comments are not to be taken as Commodore official policy.