1NEARBYINT(3P)              POSIX Programmer's Manual             NEARBYINT(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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11

NAME

13       nearbyint, nearbyintf, nearbyintl — floating-point rounding functions
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SYNOPSIS

16       #include <math.h>
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18       double nearbyint(double x);
19       float nearbyintf(float x);
20       long double nearbyintl(long double x);
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DESCRIPTION

23       The functionality described on this reference page is aligned with  the
24       ISO C  standard.  Any  conflict between the requirements described here
25       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
26       defers to the ISO C standard.
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28       These  functions  shall  round  their  argument  to an integer value in
29       floating-point format, using the current rounding direction and without
30       raising the inexact floating-point exception.
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RETURN VALUE

33       Upon  successful  completion,  these functions shall return the rounded
34       integer value.  The result shall have the same sign as x.
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36       If x is NaN, a NaN shall be returned.
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38       If x is ±0, ±0 shall be returned.
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40       If x is ±Inf, x shall be returned.
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ERRORS

43       No errors are defined.
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45       The following sections are informative.
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EXAMPLES

48       None.
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APPLICATION USAGE

51       The integral value returned by these functions need not be  expressible
52       as  an intmax_t.  The return value should be tested before assigning it
53       to an integer type to avoid the undefined results of an  integer  over‐
54       flow.
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RATIONALE

57       None.
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FUTURE DIRECTIONS

60       None.
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SEE ALSO

63       feclearexcept(), fetestexcept()
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65       The Base Definitions volume of POSIX.1‐2008, Section 4.19, Treatment of
66       Error Conditions for Mathematical Functions, <math.h>
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69       Portions of this text are reprinted and reproduced in  electronic  form
70       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
71       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
72       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
73       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
74       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
75       event of any discrepancy between this version and the original IEEE and
76       The  Open Group Standard, the original IEEE and The Open Group Standard
77       is the referee document. The original Standard can be  obtained  online
78       at http://www.unix.org/online.html .
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80       Any  typographical  or  formatting  errors that appear in this page are
81       most likely to have been introduced during the conversion of the source
82       files  to  man page format. To report such errors, see https://www.ker‐
83       nel.org/doc/man-pages/reporting_bugs.html .
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87IEEE/The Open Group                  2013                        NEARBYINT(3P)
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