Q62208: Environment Variable Must Be Uppercase in ENVIRON$

Article: Q62208
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | SR# S900507-4 B_BasicCom | mspl13_basic
Last Modified: 29-JAN-1991

If "Set name=test" is entered in lowercase letters at the DOS command
line, the ENVIRON$("NAME") function returns "test" only if "name" is
in all uppercase letters in the ENVIRON$ function. If "name" is not in
uppercase letters or if it is in mixed case, a null string will be
returned. In other words, the argument to the ENVIRON$ function must
be in all uppercase letters or a null string will be returned.

This behavior occurs in Microsoft QuickBASIC versions 4.00, 4.00b, and
4.50, Microsoft BASIC Compiler versions 6.00 and 6.00b, and Microsoft
BASIC Professional Development System (PDS) versions 7.00 and 7.10 for
MS-DOS.

Program
-------

   A$= ENVIRON$("NAME")          'Don't use ENVIRON$("name")
   PRINT A$

Output
------

   test

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