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Q106730: BUG: F6103 Reading "0." into COMPLEX Number

Article: Q106730
Product(s): Microsoft Fortran Compiler
Version(s): 1.0,1.0a,4.0
Operating System(s): 
Keyword(s): kbLangFortrankbbuglist
Last Modified: 03-NOV-1999

-------------------------------------------------------------------------------
The information in this article applies to:

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

SYMPTOMS
========

Attempting to READ "0." into a COMPLEX variable produces the following error:

  run-time error F6103: READ(file_name)
  - invalid real

This error occurs with standard- or list-directed formats on internal and
external files.

Inputs of 0, 0.0, and .0 as well as all other numbers ending in a decimal point
can be correctly read into COMPLEX variables.

RESOLUTION
==========

Input 0 (zero) rather than 0. when reading complex values using formatted I/O.

STATUS
======

Microsoft has confirmed this to be a problem 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
================

The following program demonstrates that with PowerStation, imputing 0, 0.0, or
1. does not produce any errors, but imputing 0. produces the F6103 invalid real
error. The output when compiled with PowerStation is:

  In: 1.,1.     Out:           (1.000000,1.000000), error #:     0
  In: 1.,0.     Out:           (1.000000,1.000000), error #:  6103
  In: 0.,1.     Out:           (1.000000,1.000000), error #:  6103
  In: 0.0,0.0   Out:   (0.000000E+00,0.000000E+00), error #:     0
  In: 0,0       Out:   (0.000000E+00,0.000000E+00), error #:     0

Sample Code #1
--------------

  Compile options: none

        COMPLEX*8 c1
        INTEGER*4 Lerr
        character*7 s(5)
        data s/'1.,1.', '1.,0.', '0.,1.', '0.0,0.0', '0,0'/ 

        do 1 i=1,5
          READ  (s(i), '(2F6.0)', IOSTAT=Lerr) c1
          WRITE (*,*) ' In: '//s(i)//'   Out:',c1,', error #:',Lerr
   1    continue
        END

Additional query words: 1.00 4.00

======================================================================
Keywords          : kbLangFortran kbbuglist
Technology        : kbAudDeveloper kbFortranSearch kbZNotKeyword2 kbZNotKeyword3 kbFORTRANPower32100NT kbFORTRANPower32400NT kbFORTRANPower100DOS kbFORTRANPower100aDOS
Version           : :1.0,1.0a,4.0

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

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