Re: Variable declaration in "for" loop initialization expression?
Re: Variable declaration in "for" loop initialization expression?
- Subject: Re: Variable declaration in "for" loop initialization expression?
- From: Graham Cox <email@hidden>
- Date: Thu, 18 Nov 2010 22:47:38 +1100
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
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden