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Q26588: FPSEG() and FP_OFF() Require DOS.H to Avoid C2106 Error

Article: Q26588
Product(s): See article
Version(s): 5.00 5.10 6.00 6.00a | 5.00 5.10 6.00 6.00a
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | s_quickc | mspl13_c
Last Modified: 15-JAN-1991

Problem:

When I use the FP_SEG() and FP_OFF() macros on the left side of an
assignment statement to set (rather than get) segment and offset
values, the compiler generates the error, "C2106: left operand must be
an lvalue."

Response:

You must include the DOS.H header file in your program; otherwise, the
compiler believes FP_SEG() and FP_OFF() are function calls rather than
macro definitions. Because a function is not an lvalue, it generates
the C2106 error. For more information on the FP_SEG() and FP_OFF()
macros, consult the run-time library reference or online help that
shipped with your version of the compiler.

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