PRB: F2347 or F2201 Error When Function Is Not Typed

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

SYMPTOMS

When compiling, you receive the following error message:

   F2347: <function name> : missing Type

   F2201: <function name> : Type redefined

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

   error FOR2290: implicit type for FUNC

Sample Code to Demonstrate Behavior

/* Compile options needed: none
*/
      PROGRAM test

      REAL a, b

      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