Re: Windows gfortran binaries

Beliavsky <beliavsky@xxxxxxx> wrote:

On Mar 15, 2:11 pm, Ken Fairfield <K...@xxxxxxxxxxxxxxxxxxxxx> wrote:

character (len=1), parameter :: letters(2) = (/"a","b"/)
....
integer, intent(in) :: ivec(:)
write (*,*) "a" // letters(ivec)
....
Is "letters(ivec)" standard-conforming?
...
Yes, letters(ivec) is standard-conforming -- it is an example of a
"vector subscript", a very useful feature introduced in Fortran 90.

In addition to letters(ivec) being a vector subscript, there is one
other thing going on here that might not be obvious to some (but is fine
and standard-conforming).

Because letters(ivec) is an array, the concatenation here is an
elemental operation. Suppose, by way of example, that ivec=[1,2,2], so
that letters(ivec)=["a","b","b"]. The concatenation does *NOT*
concatenate the elements of the array together. Instead, it elementally
concatenates the scalar "a" with each element of the array. Thus
"a"//letters(ivec) evaluates to the array ["aa","ab","ab"].

--
Richard Maine | Good judgement comes from experience;
email: last name at domain . net | experience comes from bad judgement.
domain: summertriangle | -- Mark Twain
.

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