Q48479: Correction for BASIC Calling POWER2, "Mixed-Language": Page 81

Article: Q48479
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | docerr B_BasicCom S_C H_MASM S_PasCal | mspl13_basic
Last Modified: 7-FEB-1990

The following correction applies to Page 81 of the "Microsoft
Mixed-Language Programming Guide," which is provided with C Versions
5.00 and 5.10, Macro Assembler Versions 5.00 and 5.10, and Pascal
Version 4.00 (but is NOT provided with QuickBASIC Version 4.00, 4.00b,
or 4.50, Microsoft BASIC Compiler Version 6.00 or 6.00b, or Microsoft
BASIC Professional Development System (PDS) Version 7.00).

On Page 81 of the "Microsoft Mixed-Language Programming Guide," the
BASIC program example is incomplete. The structure of the code as
shown incorrectly returns a value of 0 (zero) for the POWER2 assembler
function. This error occurs because POWER2(3,5) is interpreted by
BASIC to be an array as opposed to a FUNCTION as it was intended to
be.

To correct the program, add the following line after the DEFINT A-Z
statement:

   DECLARE FUNCTION Power2 (x, y)

The program in its entirety should read:

   DEFINT A-Z
   DECLARE FUNCTION Power2 (x, y)
   PRINT "3 times 2 to the power of 5 is ";
   PRINT Power2(3,5)
   END

This BASIC program can be compiled with Microsoft QuickBASIC Versions
4.00, 4.00b, and 4.50 for MS-DOS, Microsoft BASIC Compiler Versions
6.00 and 6.00b for MS-DOS and MS OS/2, or Microsoft BASIC PDS Version
7.00 for MS-DOS and MS OS/2.

The assembly language routine on Page 82 is correct and returns the
expected values when you add the above DECLARE in the BASIC code.

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