[Ilugc] Re: Re: [C] Swap integers without using temp variable
binand at gmail.com
Tue Apr 19 09:30:12 IST 2005
On 19/04/05, Sridharan Anand <sanand at au-kbc.org> wrote:
> > will grok if you call it as swap(v,v).
> Just a nit. You also meant to pass pointers, presumably,
> and to check equivalence inside swap ()? Then it would grok.
When I typed that, I had in mind a macro-implementation of swap().
Sorry I was not clear.
A function implementation will fail in all cases where the variables
are declared with the "register" storage class (since you cannot have
pointers to them).
> Absolutely. Totally agree with you here. You could have said
> `the One True Way of doing it is ...' but that would have started a flame
> war :-D !
"Asking how to swap to variables without using a temporary is like
asking how to drive a nail without using a hammer. The correct answer
is not "use xor" or "use your forehead", it's "why do you want to do
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