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Q123689: PRB: F2347 or F2201 Error When Function Is Not Typed

Article: Q123689
Product(s): Microsoft Fortran Compiler
Version(s): 1.0,1.0a,4.0,5.1
Operating System(s): 
Keyword(s): kberrmsg
Last Modified: 03-NOV-1999

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The information in this article applies to:

- Microsoft FORTRAN Compiler for MS-DOS, version 5.1 
- Microsoft FORTRAN PowerStation for MS-DOS, versions 1.0, 1.0a 
- Microsoft Fortran Powerstation 32 for Windows NT, versions 1.0, 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

When compiling, you receive the following error message:

  F2347: <function name> : missing Type

You may also receive the following error message:

  F2201: <function name> : Type redefined

Error F2347 is not documented in the Microsoft FORTRAN Professional Development
System version 5.1.

CAUSE
=====

The return type of a FORTRAN function must be declared in the calling scope. If
the type is not defined, implicit typing will occur. If you use the IMPLICIT
NONE statement, you will receive the F2347 error. If you do not use the IMPLICIT
NONE statement and the implicit typing does not agree with the formal
declaration of the function, you will receive the F2201 error.

RESOLUTION
==========

Provide explicit typing for FORTRAN functions, as in the code sample below.

STATUS
======

This behavior is by design.

MORE INFORMATION
================

Compiling the sample code that follows will generate the F2201 error. Removing
the comment on the IMPLICIT NONE line will cause it to generate the F2347 error
in addition to the F2201 error. Removing the comment on the INTEGER func line
will resolve both errors.

NOTE: Under Fortran PowerStation 4.0 the following error message is displayed
when compiling the Sample Code as given:

  error FOR2205: wrong data type for reference to FUNCTION FUNC from procedure
  TEST

The following error message is displayed if you uncomment the IMPLICIT NONE
line:

  error FOR2290: implicit type for FUNC

Sample Code to Demonstrate Behavior
-----------------------------------

  /* Compile options needed: none
  */ 
        PROGRAM test

  C      IMPLICIT NONE

        REAL a, b
  C      INTEGER func

        a = 2.0
        b = 3.0
        b = func(a, b)
        WRITE(*, *) func(a, b)

        END

        INTEGER FUNCTION func(a, b)
        REAL a, b

        PRINT*, a, b

        func = int(a)

        RETURN
        END

Additional query words: 5.10 1.00 1.00a 4.00 docerr errmsg err msg

======================================================================
Keywords          : kberrmsg 
Technology        : kbAudDeveloper kbFortranSearch kbZNotKeyword2 kbZNotKeyword3 kbFORTRAN510DOS kbFORTRANPower32100NT kbFORTRANPower32400NT kbFORTRANPower100DOS kbFORTRANPower100aDOS
Version           : :1.0,1.0a,4.0,5.1

=============================================================================

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