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Asked: 2026-06-15T11:23:06+00:00

I am trying to create a module for a fortran 90 program. The file

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I am trying to create a module for a fortran 90 program. The file is called epath.f90. When I try to create the file epath.mod by running an object-only compile on the file by way of the commad f95 -c epath.f90 it gives me the following error message: 

epath.f90:1:

MODULE euler-path
1
Error: Unclassifiable statement at (1)
epath.f90:8.3:

END MODULE euler-path
   1
Error: Expecting END PROGRAM statement at (1)
Error: Unexpected end of file in 'epath.f90'

The code for epath.f90 is:

MODULE euler-path

INTEGER, PARAMETER :: NSTEPS=10
REAL, PARAMETER :: A=0.0, B=1.0, YSTART=0.0
REAL, DIMENSION(0:NSTEPS) :: x,y

END MODULE euler-path

I took the same steps for another module and it worked fine. Any help is appreciated.

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1 Answer

  1. Editorial Team

    In Fortran, names – module names, variable names, etc – have to start with a letter and contain only letters, digits, or underscores. (Fortran in particular forbids using special characters like operators, eg, -/+/*/(/) in names because it’s historically taken a very cavalier approach to the use of spaces, or for that matter explicitly defined variable names, which would make it very difficult to distinguish between a-b as a name and the expression a - b.) See, eg, section 3.2.2 (“Names”) of the recent Fortran standard.

    So euler_path is ok, euler_path123 is ok, but euler-path isn’t.

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