Re: What attributes of a programming language simplify its use?

On 12/8/22 2:53 AM, Keith Thompson wrote:
> Hans-Peter Diettrich <DrDiettrich1@netscape.net> writes:
>> On 12/6/22 6:56 PM, Keith Thompson wrote:
> [...]
>>> "int int" is a syntax error.
>>
>> I could not find in the (older) C++ grammar why "int int" should be a
>> *syntax* error. Aren't both "int" and "long" simple-type-specifier's
>> which can occur multiple times in a decl-specifier-seq?
>
> No, there are specific rules that specify the way they can be used.
> In the 2011 ISO C standard standard (I use the draft from
> https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf), the valid
> type specifiers are listed in section 6.7.2.


Thanks for the link :-)


> At least one type specifier shall be given in the declaration
> specifiers in each declaration, and in the specifier-qualifier
> list in each struct declaration and type name. Each list of type
> specifiers shall be one of the following multisets (delimited
> by commas, when there is more than one multiset per item);
> the type specifiers may occur in any order, possibly intermixed
> with the other declaration specifiers.


So let me repeat my questions:


- Why is "int int" a syntax error? "At least one..." allows for more
than one type-specifier in declaration-specifiers (6.7).


- What's "long int long"? My current (Arduino) C++ compiler doesn't flag
it as an error.


DoDi
[This is getting close to comp.lang.c but I'm OK with a little more
discussion of the design decisions in C's very messy declarations. -John]

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