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LRINT(3) Linux Programmer's Manual LRINT(3)

NAME

     lrint,  lrintf,  lrintl,  llrint,  llrintf,  llrintl - round to nearest
     integer

SYNOPSIS

     #include <math.h>

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

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

     Link with -lm.

 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

     All functions shown above:
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

DESCRIPTION

     These functions round their argument  to  the  nearest  integer  value,
     using the current rounding direction (see fesetround(3)).

     Note  that  unlike  the rint(3) family of functions, the return type of
     these functions differs from that of their arguments.

RETURN VALUE

     These functions return the rounded integer value.

     If x is a NaN or an infinity, or the rounded value is too large  to  be
     stored  in  a long (long long in the case of the ll* functions), then a
     domain error occurs, and the return value is unspecified.

ERRORS

     See math_error(7) for information on how to determine whether an  error
     has occurred when calling these functions.

     The following errors can occur:

     Domain error: x is a NaN or infinite, or the rounded value is too large
            An invalid floating-point exception (FE_INVALID) is raised.

     These functions do not set errno.

VERSIONS

     These functions first appeared in glibc in version 2.1.

ATTRIBUTES

     For   an   explanation   of   the  terms  used  in  this  section,  see
     attributes(7).

     allbox; lbw30 lb lb  l  l  l.   Interface Attribute Value  T{  lrint(),
     lrintf(), lrintl(),
     llrint(), llrintf(), llrintl() T}   Thread safety  MT-Safe

CONFORMING TO

     C99, POSIX.1-2001, POSIX.1-2008.