On 18/11/2010, at 10:28 PM, Oleg Krupnov wrote:
> Hi,
>
> I know, this is a very basic question, but after learning so many
> programming languages, my head seems like a mess.
>
> In C that is in Objective-C, what is the correct/preferable way to
> declare the counter variable in a for loop?
>
> Type i;
> for (i = 0; i < N; ++ i) { statements }
>
> or
>
> for (Type i = 0; i < N; ++i) { statements }
Both are correct, but the latter form is only legal in C99, so if you do not
have C99 enabled, you'll get a syntax error. I don't think there is any
significant advantage to either form, except the latter is perhaps a bit more
compact in source code. It shouldn't make any difference to the object code.
> But what about for (;;) ? The compiler does not point to it as an
> error if I declare the counter inside the for () brackets, but I want
> to make sure!
Again, it's only legal in C99.
--Graham
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