Re^3: One out of three ain't bad

I'll disagree here an say a form like...

if( !$x && !$y &&  $z or
    !$x &&  $y && !$z or
     $x && !$y && !$z    )
{
    print "Exactly one...";
}
[download]

...is easier to maintain because it is more explicit as to what is required for a truth value. Anyone versed in boolean algebra will easily recognize the sum-of-product form here and instantly grasp the intent.

Comment on Re^3: One out of three ain't bad Download Code

Replies are listed 'Best First'.
Re^4: One out of three ain't bad by QM (Parson) on Oct 24, 2005 at 03:35 UTC
`if( !$x && !$y && $z or !$x && $y && !$z or $x && !$y && !$z ) { print "Exactly one..."; }` [download] I don't think I was clear. I should have added: "How do you expand that for 7, 42, or 105 variables?" It can be done mechanically, fairly easily, but I wouldn't want to end up with an arrangement of 105 x 105, nor would I want to maintain it. One might argue that getting from K to K+1 or K-1 variables is also easy (and it is). But I still wouldn't want to deal with it when I could use a list syntax instead. Cheers, -QM -- Quantum Mechanics: The dreams stuff is made of	[reply] [d/l]

Replies are listed 'Best First'.

Re^4: One out of three ain't bad
by QM (Parson) on Oct 24, 2005 at 03:35 UTC

if( !$x && !$y && $z or !$x && $y && !$z or $x && !$y && !$z ) { print "Exactly one..."; }
[download]

One might argue that getting from K to K+1 or K-1 variables is also easy (and it is). But I still wouldn't want to deal with it when I could use a list syntax instead.

Cheers,

-QM
--
Quantum Mechanics: The dreams stuff is made of

[reply]
[d/l]