Re: "A diagram of C23 basic types"

On 09/04/2025 11:49, Michael S wrote:

On Fri, 4 Apr 2025 02:57:10 -0000 (UTC)
Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
 

On Thu, 3 Apr 2025 21:48:40 +0100, bart wrote:
>

Commas are overwhelmingly used to separate list elements in
programming languages.

>
Not just separate, but terminate.

 I disagree. I am in favor of optional trailing commas rather than
mandatory ones.

I am certainly in favour of them for things like initialiser lists and enum declarations.

 

All the reasonable languages allow
trailing commas.

 Are your sure that C Standard does not allow trailing commas?
That is, they are obviously legal in initializer lists.
All compilers that I tried reject trailing comma in function calls.
 

...

But is it (rejection) really required by the Standard? I don't know.
 

Yes.  The syntax (in 6.5.2p1) is :
postfix-expression:
...
postfix-expression ( argument-expression-list opt )
...
argument-expression-list :
argument-expression
argument-expression-list , argument-expression
I don't think it is unreasonable to suggest that it might be nice to allow a trailing comma, at least in variadic function calls, but the syntax of C does not allow it.