dollar sign in macros

[Ben Pfaff]

Re: dollar sign in macros

Random832 <random@random. yi.orgwrites:

Is \u0024 allowed in identifiers?

No. See C99 6.4.2.1:

3 Each universal character name in an identifier shall designate
a character whose encoding in ISO/IEC 10646 falls into one
of the ranges specified in annex D.59)

0024 isn't in the list in annex D.

I posted the opposite answer earlier in this thread, but I was
wrong. I was confused by 6.4.3, which specifically adds 0024 to
the list of values allowed in a universal-character-name.

Is there a list of what UCNs are and are not allowed in identifiers?

Annex D in the standard gives a complete list.
--
"You call this a *C* question? What the hell are you smoking?" --Kaz

[av]

Re: dollar sign in macros

On 4 Dec 2006 15:08:58 -0800, Spiros Bousbouras wrote:

>As others have said $ is probably part of the name of
>the variable and not allowed in standard C. Some compilers
>allow as an extension $ to be part of an identifier name ;
>for example gcc.

it seems bcc32 too

[Kevin Handy]

Re: dollar sign in macros

Mark McIntyre wrote:

On 4 Dec 2006 14:03:55 -0800, in comp.lang.c , "Digital Puer"
<digital_puer@h otmail.comwrote :
>
>

>>I've inherited some code where the coder placed dollar signs in
>>his preprocessor macros. What is the significance of the
>>dollar signs ($) ?

>
>
reminds me of the old VAX/VMS system routines/variables.

VMS (not limited to just the vax version) uses the dollar
sign in it's system routines as a seperator from the
"service" and the function parts of the name. The names
look something like (made up names) "sys$open", "str$compar e",
"pascal$foobar" , etc.

The dollar sign isn't really tied to system routines,
you can actually use them in your own programs,
but you take the chance of overlapping with some existing
VMS variables/functions, so it's not really a good idea.

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