1CBRT(3P)                   POSIX Programmer's Manual                  CBRT(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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NAME

13       cbrt, cbrtf, cbrtl — cube root functions
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SYNOPSIS

16       #include <math.h>
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18       double cbrt(double x);
19       float cbrtf(float x);
20       long double cbrtl(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 compute the real cube root of their argument x.
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RETURN VALUE

31       Upon  successful completion, these functions shall return the cube root
32       of x.
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34       If x is NaN, a NaN shall be returned.
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36       If x is ±0 or ±Inf, x shall be returned.
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ERRORS

39       No errors are defined.
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41       The following sections are informative.
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EXAMPLES

44       None.
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APPLICATION USAGE

47       None.
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RATIONALE

50       For some applications, a true cube root function, which  returns  nega‐
51       tive  results  for  negative arguments, is more appropriate than pow(x,
52       1.0/3.0), which returns a NaN for x less than 0.
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FUTURE DIRECTIONS

55       None.
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SEE ALSO

58       The Base Definitions volume of POSIX.1‐2008, <math.h>
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61       Portions of this text are reprinted and reproduced in  electronic  form
62       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
63       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
64       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
65       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
66       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
67       event of any discrepancy between this version and the original IEEE and
68       The  Open Group Standard, the original IEEE and The Open Group Standard
69       is the referee document. The original Standard can be  obtained  online
70       at http://www.unix.org/online.html .
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72       Any  typographical  or  formatting  errors that appear in this page are
73       most likely to have been introduced during the conversion of the source
74       files  to  man page format. To report such errors, see https://www.ker‐
75       nel.org/doc/man-pages/reporting_bugs.html .
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79IEEE/The Open Group                  2013                             CBRT(3P)
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