function cast?

function cast?

[Randi Botse]

Hi All,

Sometimes i see codes are written like this:

(void) printf(fmt);

- or -

(void) close(fd);

What these means? i think it is not necessary to put that 'void' on a
statement, or it just like when we cast a data type? so the email

Thanks,

function cast?

[Randi Botse]

(sorry for my first uncomplete email, please abandon the first mail)

Hi All,

Sometimes i see codes are written like this:

(void) printf(fmt);

- or -

(void) close(fd);

What these means? i think it is not necessary to put that 'void' on a
statement, or it just like when we cast a data type like:

double d = 93.43;
int i = (int) d;

but why those function need to be casted in a 'void' ?

Thanks,

Re: function cast?

[Manish Katiyar]

On Thu, Jan 28, 2010 at 11:39 AM, Randi Botse <nightdecoder@gmail.com> wrote:
> (sorry for my first uncomplete email, please abandon the first mail)
>
> Hi All,
>
> Sometimes i see codes are written like this:
>
> (void) printf(fmt);
>
> - or -
>
> (void) close(fd);
>
> What these means? i think it is not necessary to put that 'void' on a
> statement, or it just like when we cast a data type like:
>
> double d = 93.43;
> int i = (int) d;
>
> but why those function need to be casted in a 'void' ?

Some time it is also to shut up static analysis tools, which might
crib if the function is supposed to return a value and you have not
used the return value. It might be intentional or you might have just
missed. So inorder to show that it is intetional not to use the return
value we typecast it.

Thanks -
Manish

>
> Thanks,
> --
> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
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>



-- 
Thanks -
Manish
==================================
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==================================
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Re: Re: function cast?

[phil song]

HI,Manish Katiyar!

	thanks,I see too now.

======= 2010-01-28 14:24:58 The letter which you writted before:=======

>On Thu, Jan 28, 2010 at 11:39 AM, Randi Botse <nightdecoder@gmail.com> wrote:
>> (sorry for my first uncomplete email, please abandon the first mail)
>>
>> Hi All,
>>
>> Sometimes i see codes are written like this:
>>
>> (void) printf(fmt);
>>
>> - or -
>>
>> (void) close(fd);
>>
>> What these means? i think it is not necessary to put that 'void' on a
>> statement, or it just like when we cast a data type like:
>>
>> double d = 93.43;
>> int i = (int) d;
>>
>> but why those function need to be casted in a 'void' ?
>
>Some time it is also to shut up static analysis tools, which might
>crib if the function is supposed to return a value and you have not
>used the return value. It might be intentional or you might have just
>missed. So inorder to show that it is intetional not to use the return
>value we typecast it.
>
>Thanks -
>Manish
>
>>
>> Thanks,
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>
>
>
>-- 
>Thanks -
>Manish
>==================================
>[$\*.^ -- I miss being one of them
>==================================
>--
>To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html

= = = = = = = = = = = = = = = = = = = =
			

Sincerely
 
phil song
philsong@techtrex.com
2010-02-01