_clear87

Clears floating-point status word.

Defined in header <float.h>

Syntax

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

Portability

Remarks

_clear87 clears the floating-point status word, which is a combination of the 80x87 status word and other conditions detected by the 80x87 exception handler.

Return value

The bits in the value returned indicate the floating-point status before it was cleared. For information on the status word, refer to the constants defined in float.h.

See also

• _control87
• _fpreset
• _status87

Example

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

int main(void)
{
   float x;
   double y = 1.5e-100;
   printf("\nStatus 87 before  error: %X\n", _status87 ());
   X = y; /* create underflow  and precision loss */
   printf("Status 87 after   error: %X\n", _status87());
   _clear87();
   printf("Status 87 after   clear: %X\n", _status87());
   y = x;
   return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

• Microsoft C runtime (search)

These are search links, not yet checked by hand.

Extraction notes

• heading `clear87` read as `_clear87`

Stable link: /3.1/float.h/_clear87/ · short form /3.1/_clear87/