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
Library:
libm
Use the -l m option to qcc to link against this library.
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 |