xref: /openbsd-src/lib/libm/man/sqrt.3 (revision f420855876ea7e2c0d9883f924d7fdd743d5f924)

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.\"     from: @(#)sqrt.3	6.4 (Berkeley) 5/6/91
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.Dd $Mdocdate: June 29 2021 $
.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 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
function computes the cube root of
.Fa x .
The
.Fn cbrtf
function is a single precision version of
.Fn cbrt .
The
.Fn cbrtl
function is an extended precision version of
.Fn cbrt .
.Pp
The
.Fn sqrt
function computes
the non-negative square root of
.Fa x .
The
.Fn sqrtf
function is a single precision version of
.Fn sqrt .
The
.Fn sqrtl
function is an extended precision version of
.Fn sqrt .
.Sh RETURN VALUES
If
.Fa x
is negative,
.Fn sqrt "x" ,
.Fn sqrtf "x"
and
.Fn sqrtl "x"
set the global variable
.Va errno
to
.Er EDOM .
.Sh HISTORY
A
.Fn sqrt
function first appeared in
.At v2 .
.Pp
The
.Fn cbrt
function appeared in
.Bx 4.3 .