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.\" from: @(#)hypot.3 6.7 (Berkeley) 5/6/91
.\" $Id: hypot.3,v 1.4 2004/12/20 21:35:45 scp Exp $
.\"
.Dd January 28, 2003
.Dt HYPOT 3
.Os BSD 4
.Sh NAME
.Nm hypot
.Nd euclidean distance function
.Sh SYNOPSIS
.Fd #include
.Ft double
.Fn hypot "double x" "double y"
.Ft long double
.Fn hypotl "long double x" "long double y"
.Ft float
.Fn hypotf "float x" "float y"
.Sh DESCRIPTION
The
.Fn hypot
function
computes the
sqrt(x*x+y*y)
without undue overflow or underflow.
.Sh SPECIAL VALUES
.Fn hypot "x" "y"
,
.Fn hypot "y" "x"
, and
.Fn hypot "x" "-y"
are equivalent.
.Pp
.Fn hypot "x" "+-0"
is equivalent to
.Fn fabs "x".
.Pp
.Fn hypot "+-infinity" "y"
returns +infinity even if y is a NaN.
.Sh SEE ALSO
.Xr cabs 3 ,
.Xr math 3 ,
.Xr sqrt 3
.Sh STANDARDS
The
.Fn hypot
function conforms to ISO/IEC 9899:1999(E).