SQRT(3) BSD Programmer's Manual SQRT(3)NAME
cbrt, cbrtf, sqrt, sqrtf - cube root and square root functions
SYNOPSIS
#include <math.h>
double
cbrt(double x);
float
cbrtf(float x);
double
sqrt(double x);
float
sqrtf(float x);
DESCRIPTION
The cbrt() and cbrtf() functions compute the cube root of x.
The sqrt() and sqrtf() functions compute the non-negative square root of
x. For a discussion of error reporting, see math(3).
ERRORS
For sqrt() or sqrtf(), if x < 0 then:
_IEEE_ The return value is NaN.
_POSIX_ Same as _IEEE_, but errno is also set to EDOM.
_XOPEN_ Same as _POSIX_, but errno is only set if matherr(3) returns 0.
The exception type is DOMAIN.
_SVID_ Same as _XOPEN_, but the return value is 0, and a message is
printed to stderr if errno is set.
SEE ALSOmath(3)STANDARDS
The sqrt function conforms to ANSI C X3.159-1989 (``ANSI C '').
HISTORY
The cbrt function appeared in 4.3BSD.
BSDI BSD/OS February 17, 1998 1