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32.\" from: @(#)hypot.3 6.7 (Berkeley) 5/6/91
33.\" $Id: hypot.3,v 1.4 2004/12/20 21:35:45 scp Exp $
34.\"
35.Dd December 11, 2006
36.Dt HYPOT 3
37.Os BSD 4
38.Sh NAME
39.Nm hypot
40.Nd euclidean distance function
41.Sh SYNOPSIS
42.Fd #include <math.h>
43.Ft double
44.Fn hypot "double x" "double y"
45.Ft long double
46.Fn hypotl "long double x" "long double y"
47.Ft float
48.Fn hypotf "float x" "float y"
49.Sh DESCRIPTION
50The
51.Fn hypot
52function
53computes the
54sqrt(x*x+y*y)
55without undue overflow or underflow.
56.Sh SPECIAL VALUES
57.Fn hypot "x" "y"
58,
59.Fn hypot "y" "x"
60, and
61.Fn hypot "x" "-y"
62are equivalent.
63.Pp
64.Fn hypot "x" "+-0"
65is equivalent to
66.Fn fabs "x".
67.Pp
68.Fn hypot "+-infinity" "y"
69returns +infinity even if y is a NaN.
70.Sh SEE ALSO
71.Xr cabs 3 ,
72.Xr math 3 ,
73.Xr sqrt 3
74.Sh STANDARDS
75The
76.Fn hypot
77function conforms to ISO/IEC 9899:1999(E).