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Linux 2.6 - man page for lround (linux section 3)

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

NAME
lround, lroundf, lroundl, llround, llroundf, llroundl - round to nearest integer
SYNOPSIS
#include <math.h> long int lround(double x); long int lroundf(float x); long int lroundl(long double x); long long int llround(double x); long long int llroundf(float x); long long int llroundl(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, rounding halfway cases away from zero, regardless of the current round- ing direction (see fenv(3)). Note that unlike the round(3) and ceil(3), 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). +----------------------------------+---------------+---------+ |Interface | Attribute | Value | +----------------------------------+---------------+---------+ |lround(), lroundf(), lroundl(), | Thread safety | MT-Safe | |llround(), llroundf(), llroundl() | | | +----------------------------------+---------------+---------+
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
SEE ALSO
ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3) 2017-09-15 LROUND(3)

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