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

 Last reviewed: July 18, 1995
Article ID: Q51295
The information in this article applies to:
  • Microsoft FORTRAN for MS-DOS and OS/2 versions 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

SYMPTOMS

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

   F4998: variable used but not defined

CAUSE

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

RESOLUTION

This behavior is expected and serves as a warning.

MORE INFORMATION

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.

Sample Code #1

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.

Sample Code #2

C Compile options needed: None 

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

Additional reference words: 1.00 5.00 5.10
KBCategory: kbtool kberrmsg kbprb
KBSubcategory: FLIss

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Last reviewed: July 18, 1995
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