SYNOPSIS

#include <math.h>

double cbrt(double x);
float cbrtf(float x);
long double cbrtl(long double x);

DESCRIPTION

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

RETURN VALUE

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.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

For some applications, a true cube root function, which returns negative results for negative arguments, is more appropriate than pow( x, 1.0/3.0), which returns a NaN for x less than 0.

FUTURE DIRECTIONS

None.

COPYRIGHT

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 original Standard can be obtained online at http://www.opengroup.org/unix/online.html .