NAME

       llrint,  llrintf,  llrintl  -  round  to  the nearest integer value using current rounding
       direction

SYNOPSIS

       #include <math.h>

       long long llrint(double x);
       long long llrintf(float x);
       long long llrintl(long double x);

DESCRIPTION

       These functions shall  round  their  argument  to  the  nearest  integer  value,  rounding
       according 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 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 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
       current  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()  ,  lrint()  ,   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 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 .