Q58122: CHAIN Line-Number Option Is in BASICA, Not in QuickBASIC

Article: Q58122
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | SR# S900125-125 B_BasicCom B_GWBasicI | mspl13_basic
Last Modified: 30-JAN-1990

The documentation for the CHAIN statement misleadingly refers to the
line-number option. The line-number option is supported in the BASICA
and GW-BASIC Interpreters, but not in compiled BASICs. This fact is
documented in the same section, "Differences from BASICA," but not in
the same paragraph, and thus might cause confusion. References to the
line-number option apply only to modifying BASICA and GW-BASIC code.

This information applies to the following manuals:

1. Page 94 of the "Microsoft QuickBASIC 4.0: BASIC Language Reference"
   manual for QuickBASIC Versions 4.00 and 4.00b for MS-DOS

2. Page 94 of the "Microsoft BASIC Compiler 6.0: BASIC Language
   Reference" manual for Versions 6.00 and 6.00b for MS OS/2 and
   MS-DOS

3. Page 38 of the "Microsoft BASIC 7.0: Language Reference" manual for
   Microsoft BASIC Professional Development System (PDS) Version 7.00
   for MS-DOS and MS OS/2

The last two paragraphs of the "Differences from BASICA" section read
as follows:

   BASIC does not support the ALL, MERGE, or DELETE, OPTIONS available
   in BASICA, nor does it allow the specification of a line number.

   Without the line-number option, execution always starts at the
   beginning of the chained-to program. Thus, a chained-to program
   that chains back to a carelessly written chaining program can cause
   an endless loop.

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