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 _status87()             Get 8087/80287 Floating-Point Status Word

 #include   <float.h>

 unsigned   int _status87(void);

    _status87() gets the floating-point status word. The floating-point
    status word combines the 8087/80287 status word with other conditions
    detected by the 8087/80287 exception handler.  The bits in the status
    word (defined in <float.h>) are assigned as:

            SW_INVALID            Invalid operation
            SW_DENORMAL           Denormal value
            SW_ZERODIVIDE         Divide by zero
            SW_OVERFLOW           Overflow
            SW_UNDERFLOW          Underflow
            SW_INEXACT            Loss of precision

       Returns:     Floating-point status word.

         Notes:     Many of the math library functions modify the status
                    word with unpredictable results.  Return values from
                    _status87() are guaranteed to be accurate when only
                    one floating-point math function or one
                    floating-point operation is performed between checks
                    of the floating-point status word.

   -------------------------------- Example ---------------------------------

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

           double a = 1e-40, b;
           float x,y;

           main()
           {
              printf("status = %.4x - clear\n",_status87());
              /*store into y is inexact and underflows*/
              y = a;
              printf("status = %.4x - inexact, underflow\n",_status87());
              /*y is denormal*/
              b = y;
              printf("status = %.4 - inexact, underflow denormal\n",
                     _status87());
             /*clear user 8087 status*/
              _clear87();
           }