PDS 7.1 and C 6.0 with C Cast of Float Causes Program Hang (71259)

This article was previously published under Q71259

SYMPTOMS

Performing type casting of a floating-point type in a Microsoft C version 6.0 or a QuickC version 2.5 routine called from a Microsoft Basic Professional Development System (PDS) version 7.1 program that uses the Basic emulator math run-time module (BRT71Exx) will cause the program to hang or display incorrect (bad) numeric results at run time.

If the Basic program is compiled as a stand-alone program (using BCL71Exx.LIB), or if both the Basic and C modules are compiled to use the alternate math package (using the /FPa compile option), the problem will not occur.

STATUS

Microsoft has confirmed this to be a bug in Microsoft Basic Professional Development System version 7.1 for MS-DOS and OS/2. Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

The following sample program demonstrates the problem:

CPROG.C

int castit(double d)
{
  return ((int) d);
}

BPROG.BAS

DECLARE FUNCTION castit CDECL (BYVAL D#)
PRINT castit(5.3#)
END

Compile and link as follows:

CL /c /AM CPROG.C ;
BC BPROG.BAS ;
LINK /NOE /NOD BPROG CPROG,,,BRT71ENR MLIBCE ;

Modification Type:	Minor	Last Reviewed:	1/9/2003
Keywords:	KB71259