float.h

guide and some example with visualC++

#ifndef _FLOATH
#define _FLOATH

#pragma push_safeptr

typedef union {
    unsigned short _Usv[4];
    float _Fv;
    double _Dv;
} _Dv_t;

#include <sys/float.h>

#pragma pop_ptr

#endif /* _FLOATH */