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

 Last reviewed: September 16, 1997
Article ID: Q106563
1.00 MS-DOS kbtool kbfixlist kbbuglist

The information in this article applies to:

  • Microsoft FORTRAN PowerStation for MS-DOS, version 1.0

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" 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 reference words: 1.00 buglist1.00 fixlist1.00a
KBCategory: kbtool kbfixlist kbbuglist
KBSubcategory: FLIss
Solution Type : kbfix

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Last reviewed: September 16, 1997
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