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Editorial Team
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Asked: 2026-05-13T08:53:32+00:00

I have the following FORTRAN SUBROUTINE SETPATHS(INPUT) !DEC$ ATTRIBUTES DLLEXPORT::SetPaths CHARACTER*20 INPUT CHARACTER*20 DIRECTORY

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I have the following FORTRAN

  SUBROUTINE SETPATHS(INPUT)
  !DEC$ ATTRIBUTES DLLEXPORT::SetPaths

  CHARACTER*20 INPUT
  CHARACTER*20 DIRECTORY

  DIRECTORY = 'ABCDEFG'

  WRITE(6, *) 'INPUT LEN_TRIM = ', LEN_TRIM(INPUT)
  WRITE(6, *) 'DIRECTORYLEN_TRIM = ', LEN_TRIM(DIRECTORY)

  END SUBROUTINE

And I’m calling the function from C#, passing in ‘ABCDEFG’.

When I set a breakpoint on my debugger, INPUT and DIRECTORY have the exact same characters. Both have ‘ABCDEFG’ followed by the same number of trailing spaces.

However, the program outputs

  INPUT LEN_TRIM = 20
  DIRECTORYLEN_TRIM = 7

Is this correct behavior? If the two strings have the same values, why does LEN_TRIM give different results?

Update: I found this documented problem (although it’s not my Intel 8.1 compiler). http://support.microsoft.com/kb/89131

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1 Answer

  1. Editorial Team

    By explicitly padding my C# StringBuilder with trailing spaces, the LEN_TRIM behaved as expected. This Microsoft KB seems to be related.

    It is strange, however, that in the debugger the trailing spaces appeared even before I did the explicit padding.

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