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These macros can be used to set and test for blank fields,  however,
PXPutBlank and PXFldBlank are quite adequate and are not dependent on type.

#define BLANKDATE       0x80000000L
#define BLANKLONG       0x80000000L
#define BLANKSHORT      0x8000
void BLANKDOUBLE(double *x);

#define ISBLANKALPHA(x)  ((x)[0]                == 0x0)
#define ISBLANKSHORT(x)  ((unsigned short)(x)   == BLANKSHORT)
#define ISBLANKLONG(x)   ((unsigned long)(x)    == BLANKLONG)
#define ISBLANKDATE(x)   ((unsigned long)(x)    == BLANKDATE)
int ISBLANKDOUBLE(double x);