Q61675: SSEGADD Example Requires Large Model (/AL) for C Routine
Article: Q61675 Product(s): See article Version(s): 7.00 | 7.00 Operating System(s): MS-DOS | OS/2 Keyword(s): ENDUSER | SR# S900501-79 docerr S_C S_QuickC | mspl13_basic Last Modified: 11-MAY-1990 The SSEGADD example on Page 351 of the "Microsoft BASIC 7.0: Language Reference" manual requires that the C routine (printmessage) be compiled with the large memory model (/AL). The following compile lines should be added for the C routine: For C 5.00 and 5.10 ------------------- CL -AL printmsg.c ; For QuickC 1.00, 1.01, 2.00, and 2.01 ------------------------------------- QCL -AL printmsg.c ; This information applies to Microsoft BASIC Professional Development System (PDS) version 7.00. In general, routines written in C (or other languages) need to be compiled either for the medium memory (/AM) or the large memory (/AL) model. The model size affects the default pointer type (near or far). When the SSEGADD example is compiled for medium model, the program runs without error, but the wrong data is displayed. This is because the printf() function is expecting a near pointer (offset in the data segment) and printmessage is accepting a far pointer (segment and offset). If you use the large memory model, printf() expects a far pointer, and the program runs correctly.
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