PRB: Error F2112 Caused by COMPLEX Number Variable

 Last reviewed: December 11, 1995
Article ID: Q39068
The information in this article applies to:
  • Microsoft FORTRAN for MS-DOS, versions 4.01, 4.1, 5.0, 5.1
  • Microsoft FORTRAN for OS/2, versions 4.1, 5.0, 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

An attempt to compile an application developed in Microsoft FORTRAN fails with the following error message: 

      Error F2112 : I : not symbolic constant.
With Microsoft FORTRAN PowerStation 32, version 4.0, this generates: 

   error FOR3083: invalid real part of COMPLEX constant

CAUSE

A FORTRAN application cannot directly manipulate complex number variables.

RESOLUTION

Use the CMPLX intrinsic function to manipulate the variable, as follows: 

   Z = CMPLX(I, 1.2)

MORE INFORMATION

On Page 24, the Microsoft FORTRAN "Language Reference and Mixed-Language Programmer's Guide" for version 4.1 describes the complex data types as follows: 

   The COMPLEX or COMPLEX*8 data type is an ordered pair of single-
   precision real numbers. COMPLEX*16 data type is an ordered pair of
   double-precision real numbers. The first number in the pair represents
   the real part of a complex number, and the second number represents the
   imaginary part.
For example, the complex number (7, 3.2) represents the number 7.0+3.2i.

The following code example demonstrates this error message.

Sample Code

C Compiler options required: None 

      COMPLEX*8 Z
      REAL*4 I
      Z = (I, 1.2)
      END

Additional reference words: 1.00 4.00 4.01 4.10 5.00 5.10
KBCategory: kbprg kberrmsg kbprb
KBSubcategory: FORTLngIss

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Last reviewed: December 11, 1995
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