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

12       cbrt, cbrtf, cbrtl — cube root functions
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SYNOPSIS

15       #include <math.h>
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17       double cbrt(double x);
18       float cbrtf(float x);
19       long double cbrtl(long double x);
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DESCRIPTION

22       The functionality described on this reference page is aligned with  the
23       ISO C  standard.  Any  conflict between the requirements described here
24       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
25       defers to the ISO C standard.
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27       These functions shall compute the real cube root of their argument x.
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RETURN VALUE

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

38       No errors are defined.
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40       The following sections are informative.
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EXAMPLES

43       None.
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APPLICATION USAGE

46       None.
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RATIONALE

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

54       None.
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SEE ALSO

57       The Base Definitions volume of POSIX.1‐2017, <math.h>
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60       Portions of this text are reprinted and reproduced in  electronic  form
61       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
62       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
63       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
64       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
65       event of any discrepancy between this version and the original IEEE and
66       The Open Group Standard, the original IEEE and The Open Group  Standard
67       is  the  referee document. The original Standard can be obtained online
68       at http://www.opengroup.org/unix/online.html .
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70       Any typographical or formatting errors that appear  in  this  page  are
71       most likely to have been introduced during the conversion of the source
72       files to man page format. To report such errors,  see  https://www.ker‐
73       nel.org/doc/man-pages/reporting_bugs.html .
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77IEEE/The Open Group                  2017                             CBRT(3P)
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