Q32641: Problem Passing Array Element to SUB Compiled with No /Debug

Article: Q32641
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | buglist4.00 buglist4.00b buglist4.50 B_BasicCom | mspl13_basic
Last Modified: 8-DEC-1989

The code sample below runs correctly when compiled with the debug
option turned off (in either the QuickBASIC environment or in an .EXE
file). The program passes an integer variable i and an array element
number i to a non-STATIC subprogram.

However, the program gives incorrect results at run time when compiled
with BC /D or with debug selected from the Make EXE File command in
the Run menu in QuickBASIC.

Microsoft has confirmed this to be a problem in QuickBASIC Versions
4.00, 4.00b, and 4.50, and in the Microsoft BASIC Compiler Versions
6.00 and 6.00b for MS-DOS and MS OS/2 (buglist6.00, buglist6.00b).
This problem has been corrected in the Microsoft BASIC Compiler
Version 7.00 (fixlist7.00).

The equivalent code works correctly in QuickBASIC Version 3.00 with or
without the /D (debug) compiler option.

The following code example demonstrates the problem:

DECLARE SUB test (i AS INTEGER, j AS INTEGER)
DIM a(2) AS INTEGER
DIM i AS INTEGER
a(1) = 1
a(2) = 2
i = 1
CALL test(i, a(i))
PRINT i, a(1), a(2)
END

SUB test (i AS INTEGER, j AS INTEGER)
i = 2
END SUB

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