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.\"     from: @(#)sqrt.3	6.4 (Berkeley) 5/6/91
.\"	$NetBSD: sqrt.3,v 1.14 2013/11/19 19:24:33 joerg Exp $
.\"
.Dd November 19, 2013
.Dt SQRT 3
.Os
.Sh NAME
.Nm cbrt ,
.Nm cbrtf ,
.Nm cbrtl ,
.Nm sqrt ,
.Nm sqrtf ,
.Nm sqrtl
.Nd cube root and square root functions
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft double
.Fn cbrt "double x"
.Ft float
.Fn cbrtf "float x"
.Ft long double
.Fn cbrtl "long double x"
.Ft double
.Fn sqrt "double x"
.Ft float
.Fn sqrtf "float x"
.Ft long double
.Fn sqrtl "long double x"
.Sh DESCRIPTION
The
.Fn cbrt ,
.Fn cbrtf
and
.Fn cbrtl
functions compute
the cube root of
.Ar x .
.Pp
The
.Fn sqrt ,
.Fn sqrtf
and
.Fn sqrtl
functions compute
the non-negative square root of x.
.Sh RETURN VALUES
If x is negative,
.Fn sqrt "x" ,
.Fn sqrtf "x"
and
.Fn sqrtl "x"
.\" POSIX_MODE
set the global variable
.Va errno
to EDOM.
.\" SYSV_MODE
.\" call
.\" .Xr matherr 3 .
.Sh SEE ALSO
.Xr math 3
.\" .Xr matherr 3
.Sh STANDARDS
The
.Fn sqrt
function conforms to
.St -ansiC .
.Sh HISTORY
The
.Fn cbrt
function appeared in
.Bx 4.3 .