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Top Forums Programming Problem with rounding using lrint Post 302985119 by jim mcnamara on Saturday 5th of November 2016 12:15:29 PM
Old 11-05-2016
Normally you call fegetround() to determine which rounding mode of the four possible ones is active.

fesetround() sets the mode. Only the fpu supported modes are available on a particular box.


For complete details try:
The GNU C Library: Rounding
 

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FEGETROUND(3)						   BSD Library Functions Manual 					     FEGETROUND(3)

NAME
fegetround, fesetround -- floating-point rounding control LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <fenv.h> #pragma STDC FENV_ACCESS ON int fegetround(void); int fesetround(int round); DESCRIPTION
The fegetround() function determines the current floating-point rounding mode, and the fesetround() function sets the current rounding mode to round. The rounding mode is one of FE_TONEAREST, FE_DOWNWARD, FE_UPWARD, or FE_TOWARDZERO, as described in fenv(3). RETURN VALUES
The fegetround() routine returns the current rounding mode. The fesetround() function returns 0 on success and non-zero otherwise; however, the present implementation always succeeds. SEE ALSO
fenv(3), fpgetround(3), fpsetround(3) STANDARDS
The fegetround() and fesetround() functions conform to ISO/IEC 9899:1999 (``ISO C99''). HISTORY
These routines first appeared in FreeBSD 5.3. They supersede the non-standard fpgetround(3) and fpsetround(3) functions. BSD
May 8, 2004 BSD
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