1LROUND(3)                  Linux Programmer's Manual                 LROUND(3)
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NAME

6       lround,  lroundf, lroundl, llround, llroundf, llroundl - round to near‐
7       est integer, away from zero
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SYNOPSIS

10       #include <math.h>
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12       long int lround(double x);
13       long int lroundf(float x);
14       long int lroundl(long double x);
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16       long long int llround(double x);
17       long long int llroundf(float x);
18       long long int llroundl(long double x);
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20       Link with -lm.
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22   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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24       All functions shown above:
25           _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
26           _POSIX_C_SOURCE >= 200112L;
27           or cc -std=c99
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DESCRIPTION

30       These  functions  round  their  argument  to the nearest integer value,
31       rounding away from zero, regardless of the current  rounding  direction
32       (see fenv(3)).
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34       Note  that  unlike  round(3),  ceil(3),  etc., the return type of these
35       functions differs from that of their arguments.
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RETURN VALUE

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

45       See math_error(7) for information on how to determine whether an  error
46       has occurred when calling these functions.
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48       The following errors can occur:
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50       Domain error: x is a NaN or infinite, or the rounded value is too large
51              An invalid floating-point exception (FE_INVALID) is raised.
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53       These functions do not set errno.
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VERSIONS

56       These functions first appeared in glibc in version 2.1.
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CONFORMING TO

59       C99, POSIX.1-2001.
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SEE ALSO

62       ceil(3), floor(3), lrint(3), nearbyint(3), rint(3), round(3)
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COLOPHON

65       This  page  is  part of release 3.53 of the Linux man-pages project.  A
66       description of the project, and information about reporting  bugs,  can
67       be found at http://www.kernel.org/doc/man-pages/.
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71                                  2010-09-20                         LROUND(3)
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