_clear87, _clearfp
Remonter à Float.h - Index
Header File
float.h
Category
Math Routines
Prototype
unsigned int _clear87 (void);
unsigned int _clearfp (void);
Description
Clears the floating-point status word.
_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.
_clearfp is identical to _clear87 and is for Microsoft compatibility.
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.
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;
}
Portability
POSIX | Win32 | ANSI C | ANSI C++ |
---|---|---|---|
+ |