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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, which combines the
    8087/80287 status word with other conditions detected by the
    8087/80287 exception handlers.  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
            SW_UNEMULATED         Unemulated instruction
            SW_SQRTNEG            Square root of negative number
            SW_STACKOVERFLOW      FP stack overflow
            SW_STACKUNDERFLOW     FP stack underflow

    Returns:    Floating-point status word.

      Notes:    Many 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.

 Portability:   Not supported by ANSI standard.

   -------------------------------- 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();
           }