Q27325: Example Passing Near Numeric Variables between BASIC and C

Article: Q27325
Product(s): See article
Version(s): 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | B_BasicCom S_C S_QuickC | mspl13_basic
Last Modified: 6-NOV-1989

The two programs shown below demonstrate how numeric variables can be
passed from compiled BASIC to Microsoft C by near reference.

This information about inter-language calling applies to QuickBASIC
Versions 4.00, 4.00b, and 4.50 for MS-DOS and to Microsoft BASIC
Compiler Versions 6.00 and 6.00b for MS-DOS and MS OS/2.

For more information about passing other types of parameters between
BASIC and C, and a list of which BASIC and C versions are compatible
with each other, query in the Software/Data Library on the following
word:

   BAS2C

Code Example
------------

The following BASIC program is BNUMNEAR.BAS, which passes each of the
standard numeric types to a C subroutine:

DECLARE SUB NumericNear CDECL (a%,b&,c!,d#)
a% = 32767
b& = 32769
c! = 123.312
d# = 129381.333#
CLS
CALL NumericNear(a%, b&, c!, d#)
END

The following program is CNUMNEAR.C, which prints out the standard
numeric values passed from BASIC:

#include <stdio.h>
void NumericNear(a, b, c, d)
   int near *a;
   long near *b;
   float near *c;
   double near *d;
 {
    printf("INTEGER %d  \n", *a);
    printf("LONG    %ld \n", *b);
    printf("FLOAT   %f  \n", *c);
    printf("DOUBLE  %lf \n", *d);
 }

To demonstrate these programs from an .EXE program, compile and link
as follows:

     BC BNUMNEAR.BAS;

     CL /c /AM CNUMNEAR.C;      < for Microsoft C Optimizing Compiler >

           or

     QCL /c /AM CNUMNEAR.C;     < for Microsoft QuickC Compiler >

     LINK /NOE BNUMNEAR CNUMNEAR;

BNUMNEAR.EXE produces the following output:

     INTEGER  32767
     LONG     32769
     FLOAT    123.311996
     DOUBLE   129381.333000

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1986-2002.