\" $NetBSD: pow.3,v 1.4 2024/01/26 23:41:55 wiz Exp $
\"
\" Copyright (c) 2011 Jukka Ruohonen <
[email protected]>
\" All rights reserved.
\"
\" Redistribution and use in source and binary forms, with or without
\" modification, are permitted provided that the following conditions
\" are met:
\" 1. Redistributions of source code must retain the above copyright
\" notice, this list of conditions and the following disclaimer.
\" 2. Redistributions in binary form must reproduce the above copyright
\" notice, this list of conditions and the following disclaimer in the
\" documentation and/or other materials provided with the distribution.
\"
\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
\" POSSIBILITY OF SUCH DAMAGE.
\"
Dd January 24, 2024
Dt POW 3
Os
Sh NAME
Nm pow ,
Nm powf ,
Nm powl
Nd power functions
Sh LIBRARY
Lb libm
Sh SYNOPSIS
In math.h
Ft double
Fn pow "double x" "double y"
Ft float
Fn powf "float x" "float y"
Ft long double
Fn powl "long double x" "long double y"
Sh DESCRIPTION
The
Fn pow
family of functions returns
Fa x
raised to the power of
Fa y .
Pp
If
Fa x
is negative and
Fa y
is not an integer, the global variable
Va errno
is set to
Er EDOM ,
and on
Tn VAX
a reserved operand fault is generated.
A portable application should nevertheless ensure that
Fa y
is an integer value whenever
Fa x
is negative.
Sh RETURN VALUES
\"
\" XXX: List also the special return values?
\"
Upon successful completion, the described functions return
Fa x^y .
Sh SEE ALSO
Xr exp 3 ,
Xr log 3
Sh STANDARDS
The described functions conform to
St -isoC-99 .
Sh HISTORY
The history of the power functions dates back to
At v6 .
