fp_rounding()
Set or get the current rounding
Synopsis:
#include <fpstatus.h>
int fp_rounding( int newrounding );
Arguments:
- newrounding
- The new rounding; one of:
- < 0 — return the current setting.
- _FP_ROUND_NEAREST
- _FP_ROUND_ZERO
- _FP_ROUND_POSITIVE
- _FP_ROUND_NEGATIVE
Description:
The fp_rounding() function sets or gets the current rounding mode, depending on the value of newrounding.
Returns:
If newrounding is less than 0, the current rounding mode; otherwise, the previous mode.
This function doesn't return a special value to indicate that an error
occurred.
If you want to check for errors, set
errno
to 0, call the function, and then check errno again.
Examples:
#include <fpstatus.h>
#include <stdlib.h>
#include <stdio.h>
int main(int argc, char** argv)
{
int ret;
ret = fp_rounding(-1);
printf("Rounding mode: ");
if (ret == _FP_ROUND_NEAREST)
printf("Nearest \n");
else if (ret == _FP_ROUND_POSITIVE)
printf("Positive \n");
else if (ret == _FP_ROUND_NEGATIVE)
printf("Negative \n");
else if (ret == _FP_ROUND_ZERO)
printf("To Zero \n");
else
printf("Error \n");
return EXIT_SUCCESS;
}
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | No |
| Thread | Yes |