_clear87()

clear the floating-point status word

Synopsis:

#include <float.h>
unsigned int _clear87( void );

Description:

The _clear87() function clears the floating-point status word, which is used to record the status of 8087/80287/80387/80486 floating-point operations.

Returns:

The old floating-point status. The description of this status is found in the <float.h> header file.

Examples:

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

void main()
  {
    unsigned int fp_status;

    fp_status = _clear87();

    printf( "80x87 status =" );
    if( fp_status & SW_INVALID )
      printf( " invalid" );
    if( fp_status & SW_DENORMAL )
      printf( " denormal" );
    if( fp_status & SW_ZERODIVIDE )
      printf( " zero_divide" );
    if( fp_status & SW_OVERFLOW )
      printf( " overflow" );
    if( fp_status & SW_UNDERFLOW )
      printf( " underflow" );
    if( fp_status & SW_INEXACT )
      printf( " inexact_result" );
    printf( "\n" );
  }

Classification:

Intel

See also:

_control87(), _fpreset(), _status87()