BUG: Run-Time Error F6511 - Variable Name Not Found

• Microsoft Fortran PowerStation for Windows 95 and Windows NT, version 4.0

SYMPTOMS

When reading a file using namelist directed input, you may get the following error:

   run-time error F6511
   - variable name not found

CAUSE

The file wasn't opened with the DELIM="{QUOTE|APOSTROPHE}" option in the Fortran OPEN statement used to open the file for writing.

Microsoft Fortran PowerStation 4.0 requires the DELIM="{QUOTE|APOSTROPHE}" option if you are opening a file that is to be written with delimiters. However, when opening and using the file for a namelist directed I/O operation, the DELIM= option is not needed. Previous versions of Fortran did not include this option and character variables were always written with delimiting apostrophe's.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Sample Code to Illustrate Problem and Workaround

! Compile options needed: none

      PROGRAM ChangeInBehavior

      CHARACTER*20 CHA
      INTEGER IA
      REAL RA

      DATA CHA /'Character A'/
      DATA IA /1000/
      DATA RA /100.0/


      NAMELIST /TheNameList/ CHA,IA,RA

! Comment out the following line to get proper behavior

      OPEN( UNIT=1, FILE='TEMP.DAT', STATUS='UNKNOWN')

      WRITE ( 1, TheNameList )
      CLOSE( 1 )

      OPEN( UNIT=1, FILE='TEMP.DAT', STATUS='UNKNOWN' )


      READ( 1, TheNameList )
      CLOSE ( 1 )

      WRITE ( *, TheNameList )

      END

REFERENCES

Microsoft Fortran PowerStation for Windows 95 and Windows NT, version 4.0, FPS 4.0 Books Online.