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Spockian illogicality

 
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LitusSaxonicum



Joined: 23 Aug 2005
Posts: 2393
Location: Yateley, Hants, UK
PostPosted: Fri Jun 16, 2023 4:06 pm    Post subject: Spockian illogicality Reply with quote
Here's a little demonstrator:
Code:

      PROGRAM TEST
      LOGICAL LABSON, LEGON
      LABSON = .TRUE.
      LEGON  = .TRUE.
      write(*,*) LABSON, LEGON
      write(*,*) LABSON .AND. LEGON
      END


As might be expected, the output is T T on one line, and T on the next.

But, in my 4000+ line program that I wrote over 30 years ago, two consecutive write statements give me T T and then F, with the F thereby failing an IF statement on the next line.

Now, I cannot recall what on earth possessed me to use LOGICAL variables in the first place, as I almost never do (and swear that I'll never do again). Instead I think I'll go back to testing for 0 and 1 in an INTEGER.

Just 32 bit mode, and doesn't need a fix, as I'll never use LOGICAL ever again!

Dan's devilry no doubt.

Eddie
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wahorger



Joined: 13 Oct 2014
Posts: 1226
Location: Morrison, CO, USA
PostPosted: Fri Jun 16, 2023 11:30 pm    Post subject: Reply with quote
I have had irreproducible issues when logicals were in COMMON and EQUIVALENCED. Especially if the logicals defaulted to LOGICAL*2 in one context and LOGICAL*4 in another context.

It was long ago, and the fix escapes me.

I wish I had documented my situation and posted it here.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 8016
Location: Salford, UK
PostPosted: Sat Jun 17, 2023 6:28 am    Post subject: Reply with quote
Eddie

Thanks for the feedback. Some issues can be difficult to track down.
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LitusSaxonicum



Joined: 23 Aug 2005
Posts: 2393
Location: Yateley, Hants, UK
PostPosted: Sun Jun 18, 2023 5:21 pm    Post subject: Reply with quote
Aye, and especially difficult as it works in one place, and not in another!
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