Syntax error at buffered='yes' in an open statement

Question

I am writing a Fortran program in which one line is written like this

open(unit=un1,file=filenm,form='unformatted',buffered='yes',status='replace',buffercount=127)

I have defined

character*256 filenm.
un1=11

but still I am getting error

"Syntax error at or near =" in that line..

Just as a note, character*256 is outdated. You should use character(len=256) :: filename — Stefano Borini, Commented Oct 19, 2011 at 11:42

Vladimir F Героям слава · Accepted Answer · 2022-01-12 10:03:37Z

5

The problem lies in the buffered='yes', which is not standard Fortran, but some vendor extension and your compiler does not recognize it. I would just delete it and also delete the buffercount=127 (mentioned in the comment).

Modern compilers and operating systems allow control of these things (external I/O buffering) by other means. For example, using environment variables in gfortran https://gcc.gnu.org/onlinedocs/gfortran/Runtime.html#Runtime

edited Jan 12, 2022 at 10:03

answered Oct 19, 2011 at 10:43

Vladimir F Героям слава

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5 Comments

user991852 Over a year ago

thanks.. i deleted buffered='yes' as well as buffercount=127 also,so that error is gone but new error "Derived type has not been declared - t_openfilename" has come in line type(T_OPENFILENAME) ofn

M. S. B. Over a year ago

Re your error message about the derived type t_openfilename not declared. With just the source code line that causes the error we can only guess. You need to declare that type before it is used. Why is it missing? Are you missing a file that defines it?

user991852 Over a year ago

thanks for reply.......actually i am from electrical background..i am trying to learn fortran for my project....please tell me any good reference from which i will get the knowledge of "type command"

Stefano Borini Over a year ago

@user991852 : important, very important: learn Fortran 95, and the distinction between old F77 constructs and new ones. Don't use old constructs. Learn to read them (if you have old code to understand) but don't use them. In particular, never use commons, namelists, or code outside modules. Always use implicit none, and specification of intent in the routine arguments.

M. S. B. Over a year ago

References: I recommend the book "Fortran 95/2003 Explained" by Metcalf, Reid and Cohen. For an overview, but probably too brief to learn from: en.wikipedia.org/wiki/Fortran_95_language_features

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