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#include <float.h>
#include <math.h>
#define NANEXP (2047<<20)
#define NANMASK (2047<<20)
#define NANSIGN (1<<31)
double
NaN(void)
{
FPdbleword a;
a.hi = NANEXP;
a.lo = 1;
return a.x;
}
int
isNaN(double d)
{
FPdbleword a;
a.x = d;
if((a.hi & NANMASK) != NANEXP)
return 0;
return !isInf(d, 0);
}
double
Inf(int sign)
{
FPdbleword a;
a.hi = NANEXP;
a.lo = 0;
if(sign < 0)
a.hi |= NANSIGN;
return a.x;
}
int
isInf(double d, int sign)
{
FPdbleword a;
a.x = d;
if(a.lo != 0)
return 0;
if(a.hi == NANEXP)
return sign >= 0;
if(a.hi == (NANEXP|NANSIGN))
return sign <= 0;
return 0;
}
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