Q106563: FIX: Unary Minus and Mixed Complex*16 with Complex*8

Article: Q106563
Product(s): Microsoft Fortran Compiler
Version(s): 1.0
Operating System(s): 
Keyword(s): 
Last Modified: 24-MAR-2000

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The information in this article applies to:

- Microsoft FORTRAN PowerStation for MS-DOS, version 1.0 
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SYMPTOMS
========

Mixing COMPLEX*16 and COMPLEX*8 variables in an expression using the unary minus
can give the wrong result.

RESOLUTION
==========

Do not use a unary minus in a mixed COMPLEX expression. Make the minus a binary
operator by subtracting the mixed COMPLEX expression from zero.

STATUS
======

Microsoft has confirmed this to be a problem in FORTRAN PowerStation version 1.0
for MS-DOS. This problem has been resolved with FORTRAN PowerStation maintenance
release version 1.0a for MS-DOS.

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

FORTRAN PowerStation version 1.0 can be differentiated from the maintenance
release version 1.0a by invoking the linker. Typing "link32 | more" (without the
quotation marks) from \F32\BIN directory will show version 2.8 for FORTRAN
PowerStation version 1.0, and it will show version 1.0f for the maintenance
release version 1.0a.

When the following sample code is run, the correct result will be displayed
first:

Sample Code
-----------

  C No compiler options required
          COMPLEX CVAR1,RESLT1,RESLT2
          COMPLEX*16 CVAR2
          CVAR1 = CMPLX(100,0)
          CVAR2 = DCMPLX(100,0)
          RESLT1 = 0 - CVAR1 * CVAR2   ! right result (binary -)
          RESLT2 =  - CVAR1 * CVAR2    ! wrong result (unary -)
          WRITE(*,*) RESLT1,RESLT2
          END

Additional query words: 1.00 buglist1.00 fixlist1.00a

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Keywords          :  
Technology        : kbAudDeveloper kbFortranSearch kbZNotKeyword3 kbFORTRANPower100DOS
Version           : :1.0
Issue type        : kbbug
Solution Type     : kbfix

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