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New Contributor II
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Broken Dr Fortran Link

New post: Doctor Fortran in “Military Strength”

 

The link is broken.  

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Black Belt Retired Employee
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Fixed - thanks. The correct link is https://stevelionel.com/drfortran/2020/05/16/doctor-fortran-in-military-strength/

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New Contributor II
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END DO as the terminal statement of a DO loop. This didn’t add the unlabeled block DO..END DO Fortran 90 would have, but it works with that.

Tahnks I have been meaning to ask why some one wanted this instead of continue.

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Black Belt Retired Employee
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The goal was to get rid of labeled DO, which happened eventually in the standard (deprecated). DO..END DO is easier to understand. It also eliminates shared loop termination, which almost nobody understood.

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New Contributor II
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I hate common use of continue statements to end do loops - it is common in old Fortran and can be a pain to eliminate.   But I dislike unnumbered do loops as they can be hard to read across multiple pages

We will never get rid of Old Fortran -- it is like old English -- we will live with it forever.  

 

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Valued Contributor II
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Well, you can use named loops (and in fact named constructs) as an alternative:

myloop: do i = 1,100

    ... a few hundred lines of code to do something useful
    enddo &
myloop

To make the end of the loop more visible I have put the label at the end on a new line.

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Valued Contributor III
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I also find that in many cases where do enddo are a long way apart the code is in need needs of some restructuring with some subprogram units to make it more readable and maintainable

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Black Belt Retired Employee
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I encourage the use of labels (the alphanumeric kind).

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New Contributor II
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There is a good rule that a piece of code wider than your hand is to long

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