LRINT(P)                                                                                 LRINT(P)



NAME
       lrint, lrintf, lrintl - round to nearest integer value using current rounding direction

SYNOPSIS
       #include <math.h>

       long lrint(double x);
       long lrintf(float x);
       long lrintl(long double x);


DESCRIPTION
       These  functions shall round their argument to the nearest integer value, rounding accord-
       ing to 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 representable 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 provide floating-to-integer conversions. They round according to the  cur-
       rent rounding direction. If the rounded value is outside the range of the return type, the
       numeric result is unspecified and the invalid floating-point  exception  is  raised.  When
       they  raise  no  other  floating-point exception and the result differs from the argument,
       they raise the inexact floating-point exception.

FUTURE DIRECTIONS
       None.

SEE ALSO
       feclearexcept()  ,  fetestexcept()  ,  llrint()  ,  the   Base   Definitions   volume   of
       IEEE Std 1003.1-2001,  Section  4.18, Treatment of Error Conditions for Mathematical Func-
       tions, <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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .



POSIX                                          2003                                      LRINT(P)