CBRT(3P) POSIX Programmer's Manual CBRT(3P)
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of
this interface may differ (consult the corresponding Linux manual page for details of
Linux behavior), or the interface may not be implemented on Linux.
cbrt, cbrtf, cbrtl - cube root functions
double cbrt(double x);
float cbrtf(float x);
long double cbrtl(long double x);
These functions shall compute the real cube root of their argument x.
Upon successful completion, these functions shall return the cube root of x.
If x is NaN, a NaN shall be returned.
If x is +-0 or +-Inf, x shall be returned.
No errors are defined.
The following sections are informative.
For some applications, a true cube root function, which returns negative results for nega-
tive arguments, is more appropriate than pow( x, 1.0/3.0), which returns a NaN for x less
The Base Definitions volume of IEEE Std 1003.1-2001, <math.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 CBRT(3P)