Em 29/12/2010 12:30, Olin Lathrop escreveu:
> PETER ONION wrote:
>>>> if(diff >=3D 0)
>>>>      byte =3D  0;
>>>> else
>>>>
>>>> {
>>>>      byte =3D  8;
>>>>      diff =3D - diff;
>>>> }
>> The ";" just terminates the "if true statement".
> But if a semicolon doesn't end the IF statement, what does end it
> unambiguously?  Or put another way, what if there was a outer IF not show=
n
> above, and ELSE was meant to be part of it, not the IF shown.  How would =
you
> then end the IF shown so that the ELSE would not be part of it?


Then the entire inner 'if' must be enclosed inside curly braces.

  if (outer_condition)
      {
      if (inner_condition) count=3D0; //TRUE case of outer IF
      }
    else
      do_something();               //FALSE case of outer IF


> For example:
>
>   if (outer_condition)
>       if (inner_condition) count=3D0; //TRUE case of outer IF
>     else
>       do_something();               //FALSE case of outer IF
>
> How do you "end" the second IF so that the ELSE belongs to the first IF? =
 If
> what you're saying above is true, then the only way to do this is to put =
the
> second IF inside brackets?  I suppose that's at least consistant, but jus=
t
> asking for easily made mistakes.  Worse, what I wrote above would not be
> interpreted as intended, but would be perfectly legal and not generate an=
y
> compile error.
>
> This is why it seemed logical that the ";" would end the inner IF.  But i=
f
> what you're saying is true (I expect it is, as I said, I'm no C whiz), it=
's
> hard to imagine what was going thru K&R's minds when they designed the
> syntax.
>
> This would be yet another reason to religiously use brackets in IF
> statements.  That's probably why I never bumped into this in real code.
>
>
> ********************************************************************
> Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
> (978) 742-9014.  Gold level PIC consultants since 2000.

__________________________________________________
Fale com seus amigos  de gra=E7a com o novo Yahoo! Messenger=20
http://br.messenger.yahoo.com/=20
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.