Re: const and volatile keywords in C
- From: Tyler Littlefield <tyler@xxxxxxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Tue, 20 Jul 2010 10:42:45 -0600
I'm not sure why you would use volatile and const, basically it checks the
value with volatile rather than reuse the old one from what I remember, which
is great for threading. Const doesn't lead to speed incrases generally, just
elimenates you assigning to it, which is helpful.
Thanks,
Tyler Littlefield
http://tds-solutions.net
Twitter: sorressean
On Jul 20, 2010, at 10:38 AM, Øyvind Lode wrote:
> Hi all:
>
> I know that the "const" keyword declares a value that cannot be change by
> the program and this may lead to better performance.
> If volatile is used the value may be changed by the program, but it may also
> be changed by some outside influence.
>
> volatile const int index3 = 12;
> volatile int index4;
>
> The difference between the two as I see it is that the first one use both
> volatile and const and assigns 12 to an integer type to the identifier named
> index3 and the second only uses volatile and declares an integer type
> identified as index4 but does not assign a value.
>
> So if I do:
>
> volatile const index3 = 12;
> volatile int index4 = 12;
>
> Now I have two int types with two identifiers named index3 and index4 with
> the same value of 12.
> What's not clear to me is why only volatile is used and what's the
> difference between using both volatile const to only use volatile?
>
>
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