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

23       These functions shall compute the real cube root of their argument x.
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RETURN VALUE

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

34       No errors are defined.
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36       The following sections are informative.
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EXAMPLES

39       None.
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APPLICATION USAGE

42       None.
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RATIONALE

45       For  some  applications, a true cube root function, which returns nega‐
46       tive results for negative arguments, is more appropriate than  pow(  x,
47       1.0/3.0), which returns a NaN for x less than 0.
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FUTURE DIRECTIONS

50       None.
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SEE ALSO

53       The Base Definitions volume of IEEE Std 1003.1-2001, <math.h>
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56       Portions  of  this text are reprinted and reproduced in electronic form
57       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
58       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
59       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
60       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
61       event of any discrepancy between this version and the original IEEE and
62       The  Open Group Standard, the original IEEE and The Open Group Standard
63       is the referee document. The original Standard can be  obtained  online
64       at http://www.opengroup.org/unix/online.html .
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68IEEE/The Open Group                  2003                             CBRT(3P)
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