#include <stdio.h>
#include <float.h>

typedef union {
    double  d;
    __int64 i;
} BITS64;

int main( int argc, char ** argv ) {
    BITS64 x;

    __try {
        _controlfp( _EM_INVALID|_EM_DENORMAL|_EM_ZERODIVIDE|_EM_OVERFLOW|_EM_UNDERFLOW|_EM_INEXACT, _MCW_EM );

        x.i = 0x7ff0000000000001;

        printf( "as int: %I64u\n", x.i );
        printf( "as dbl: %f\n",    x.d );

        x.d += 0.0;

        printf( "as dbl: %f\n",    x.d );
        printf( "as int: %I64u\n", x.i );
    }
    __except( 1 ) {
        fprintf( stderr, "Exception caught!\n" );
        exit( -1 );
    }
    return 0;
}

/*

C:\test>junk.exe
as int: 9218868437227405313
as dbl: 1.#SNAN0
as dbl: 1.#QNAN0
as int: 9221120237041090561

*/