PRB: F4998: "Variable Used But Not Defined" in Intrinsic Funcs (51295)

Microsoft FORTRAN Compiler for MS-DOS 5.0

Microsoft FORTRAN Compiler for MS-DOS 5.1

Microsoft FORTRAN PowerStation for MS-DOS 1.0

Microsoft FORTRAN PowerStation for MS-DOS 1.0a

Microsoft Fortran Powerstation 32 for Windows NT 1.0

Microsoft FORTRAN compiler for OS/2 5.0

Microsoft FORTRAN compiler for OS/2 5.1

This article was previously published under Q51295

SYMPTOMS

When the FORTRAN compiler processes a source code file, it produces the following warning message:

F4998: variable used but not defined

The file contains a variable that is used as an argument in an intrinsic function before it is assigned a value.

This behavior is expected and serves as a warning.

The following list of intrinsic functions are confirmed to produce this warning message:

abs, exp, ior, loc, locfar, locnear,
log, max, mod, not, sin, sqrt, tan

The following code example demonstrates this warning message.

C Compile options needed: None

      REAL TMP
      WRITE (*, *) SIN(TMP)
      END

The following code example eliminates this warning message by assigning a value to TMP before using it as an argument to an intrinsic function.

C Compile options needed: None

      REAL TMP
      TMP = 1
      WRITE (*, *) SIN(TMP)
      END

Modification Type:

Major

Last Reviewed:

12/1/2003

Keywords:

KB51295