posix man page for nearbyintl

NEARBYINT(P)						     POSIX Programmer's Manual						      NEARBYINT(P)

NAME
       nearbyint, nearbyintf, nearbyintl - floating-point rounding functions

SYNOPSIS
       #include <math.h>

       double nearbyint(double x);
       float nearbyintf(float x);
       long double nearbyintl(long double x);

DESCRIPTION
       These  functions  shall round their argument to an integer value in floating-point format, using the current rounding direction and without
       raising the inexact floating-point exception.

       An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT)  before  calling  these
       functions.   On	return, if errno is non-zero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error
       has occurred.

RETURN VALUE
       Upon successful completion, these functions shall return the rounded integer value.

       If x is NaN, a NaN shall be returned.

       If x is +-0, +-0 shall be returned.

       If x is +-Inf, x shall be returned.

       If the correct value would cause overflow, a range error shall occur and nearbyint(), nearbyintf(), and nearbyintl() shall return the value
       of the macro +-HUGE_VAL, +-HUGE_VALF, and +-HUGE_VALL (with the same sign as x), respectively.

ERRORS
       These functions shall fail if:

       Range Error
	      The result would cause an overflow.

       If  the	integer  expression  (math_errhandling	&  MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression
       (math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow floating-point exception shall be raised.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of  each  other,  but	at
       least one of them must be non-zero.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       feclearexcept()	,  fetestexcept()  ,  the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for
       Mathematical Functions, <math.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and  the  original  IEEE
       and  The  Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							      NEARBYINT(P)