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

NAME
       lround, lroundf, lroundl - round to nearest integer value

SYNOPSIS
       #include <math.h>

       long lround(double x);
       long lroundf(float x);
       long lroundl(long double x);

DESCRIPTION
       These  functions	 shall	round  their  argument	to the nearest integer
       value, rounding halfway cases away from zero, regardless of the current
       rounding direction.

       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 domain error shall occur and  an	unspecified  value  is
       returned.

       If  x  is  +Inf, a domain error shall occur and an unspecified value is
       returned.

       If x is -Inf, a domain error shall occur and an	unspecified  value  is
       returned.

       If  the correct value is positive and too large to represent as a long,
       a domain error shall occur and an unspecified value is returned.

       If the correct value is negative and too large to represent as a	 long,
       a domain error shall occur and an unspecified value is returned.

ERRORS
       These functions shall fail if:

       Domain Error
	      The  x argument is NaN or ±Inf, or the correct value is not rep‐
	      resentable as an integer.

       If the integer expression (math_errhandling & MATH_ERRNO) is  non-zero,
       then   errno  shall  be	set  to	 [EDOM].  If  the  integer  expression
       (math_errhandling &  MATH_ERREXCEPT)  is	 non-zero,  then  the  invalid
       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
       These functions differ from the lrint() functions in the default round‐
       ing direction, with the lround() functions rounding halfway cases  away
       from zero and needing not to raise the inexact floating-point exception
       for non-integer arguments that round to within the range of the	return
       type.

FUTURE DIRECTIONS
       None.

SEE ALSO
       feclearexcept()	,  fetestexcept()  ,  llround() , the Base Definitions
       volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Condi‐
       tions 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 Technology
       --  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			     LROUND(P)
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