RetroBBS - comp.lang.fortran - Re: Continuation in fixed format

Continuation in fixed format

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Subject: Continuation in fixed format
From: feenberg@gmail.com (Daniel Feenberg)
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by: Daniel Feenberg - Sun, 22 Oct 2023 19:04 UTC

Does anyone recall why a zero in column 6 is forbidden as a continuation marker, when all other non-blanks are allowed? Just curious.

Any theories as to why the Ratfor convention of continuing any non-comment line ending in a comma or operator (except not / for data statements) was not adopted? Another bit of curiosity.

I have been deleting over 100 messages per day this past week from the Google Groups version of clf. Any help much appreciated. There is a bulk delete function you may not know about - check the box below the magnifying glass, uncheck any legitimate messages then select the blue ! in a cicle at upper right.

Daniel Feenberg

Re: Continuation in fixed format

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From: steve@seesignature.invalid (Steve Lionel)
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Subject: Re: Continuation in fixed format
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by: Steve Lionel - Sun, 22 Oct 2023 19:19 UTC

On 10/22/2023 3:04 PM, Daniel Feenberg wrote:
> Does anyone recall why a zero in column 6 is forbidden as a continuation
> marker, when all other non-blanks are allowed?

This is one of those trivia questions I like to throw out. I wouldn't
say zero is forbidden, but it is treated as a blank. My guess is that
this was for people who started a statement with a zero in column 6,
though this throws a wrench in the works for people who number their
continuation lines and get to the tenth.

I'll also note that the character in column 6 is required to be one of
those in the "Fortran character set", at least if you're sticking to the
standard.
--
Steve Lionel
ISO/IEC JTC1/SC22/WG5 (Fortran) Convenor
Retired Intel Fortran developer/support
Email: firstname at firstnamelastname dot com
Twitter: @DoctorFortran
LinkedIn: https://www.linkedin.com/in/stevelionel
Blog: https://stevelionel.com/drfortran
WG5: https://wg5-fortran.org

"Nuclear war can ruin your whole compile." -- Karl Lehenbauer

devel / comp.lang.fortran / Re: Continuation in fixed format

Subject	Author
Continuation in fixed format	Daniel Feenberg
Re: Continuation in fixed format	Steve Lionel