[J3] What are the acceptable value separators for different Decimal= specifier?

[Robert Corbett]

All references are to J3/24-007.

You are reading the third sentence of paragraph 1 of subclause 13.11.4.1 in a way that was not intended.  The sentence was intended to say

   With the exception of adjacent undelimited
   character values,

   the values are separated

   by one or more blanks

   or by a comma, or a semicolon if the decimal
   edit mode is COMMA, optionally preceded
   by one or more blanks and optionally followed
   by one or more blanks.

With exception of adjacent undelimited
character values, a sequence of one or more
blanks serves to separate values.

The sentence could be made clearer.  An either-or clause is a possible improvement.

Bob Corbett

> On May 26, 2025, at 6:12 PM, Daniel Chen via J3 <j3 at mailman.j3-fortran.org> wrote:
> 
> 
> Hello,
> Consider the following code:
> ```
>       real :: rlarr(5) = (/1.,2.,3.,4.,5./)
>       character(80) :: buffer_comma(3)
>       character(80) :: buffer_point(3)
>       character(80) :: buffer_none(3)
>  
>       namelist /nml_r/ rlarr
>  
>       buffer_comma = (/"", "", ""/)
>       write(buffer_comma,nml_r,decimal='comma')       ! Case Comma
>       write(6,*) buffer_comma
>  
>       buffer_point = (/"", "", ""/)
>       write(buffer_point,nml_r,decimal='point')       ! Case Point
>       write(6,*) buffer_point
>  
>       buffer_none = (/"", "", ""/)
>       write(buffer_none,nml_r)                        ! Case None
>       write(6,*) buffer_none
>       end
> ```
> 
> What are the acceptable outputs for the 3 different cases?
> 
> For Case Comma, I would think the only acceptable output is something like the following with `;` as the value separator.
> ```
> &NML_R  RLARR=1,000000000; 2,000000000; 3,000000000; 4,000000000; 5,000000000           /
> ```
> 
> For Case Point, I think the following should be good with `,` as value separator
> ```
> &NML_R  RLARR=1.000000000, 2.000000000, 3.000000000, 4.000000000, 5.000000000           /
> ```
> But would a `blank` value separator also acceptable? It seems so as I couldn’t’ find anywhere in the standard that disallows it.
> ```
> &NML_R  RLARR=1.000000000 2.000000000 3.000000000 4.000000000 5.000000000           /
> ```
> 
> For Case None, the same question as Case Point.
> 
> Thanks,
> Daniel
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