FIX: PRECISION Intrinsic Function Yields Incorrect Results

Last reviewed: September 11, 1997
Article ID: Q59227

5.00 | 5.00 MS-DOS | OS/2 kbprg kbbuglist kbfixlist

The information in this article applies to:

Microsoft FORTRAN for MS-DOS and OS/2, version 5.0

SYMPTOMS

The PRECISION intrinsic function produces incorrect results when an application uses it to find the precision of a REAL number.

STATUS

Microsoft has confirmed this to be a problem with FORTRAN version 5.0 for MS-DOS and OS/2. This problem was corrected in FORTRAN version 5.1 for MS-DOS and OS/2.

MORE INFORMATION

For more information on the PRECISION intrinsic function, see page 242 of the Microsoft FORTRAN "Reference" manual for versions 5.0 and 5.1.

The following code example demonstrates this problem.

Sample Code

C Compile options needed: None

      REAL*4 VAR1
      DOUBLE PRECISION VAR2
      DATA VAR1, VAR2 /0, 0/

      WRITE (*, *) PRECISION (VAR1) ! Should output 6, but outputs 15
      WRITE (*, *) PRECISION (VAR2) ! Correctly outputs a 15
      END

Additional reference words: 5.00 buglist5.00 fixlist5.10
KBCategory: kbprg kbbuglist kbfixlist
KBSubCategory: FORTLngIss
Solution Type : kbfix

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Last reviewed: September 11, 1997
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