@c ----------------------------------------------------------------------
@node hypot, math
@subheading Syntax

@example
#include <math.h>

double hypot(double x, double y);
@end example

@subheading Description

This function computes @code{sqrt(@var{x}*@var{x} + @var{y}*@var{y})},
the length of a hypotenuse of a right triangle whose shorter sides are
@var{x} and @var{y}.  In other words, it computes the Euclidean distance
between the points @code{(0,0)} and @code{(@var{x},@var{y})}.  Since the
computation is done in extended precision, there is no danger of
overflow or underflow when squaring the arguments, whereas direct
computation of @code{sqrt(@var{x}*@var{x} + @var{y}*@var{y})} could
cause overflow or underflow for extreme (very large or very small)
values of @var{x} and @var{y}.

@subheading Return Value

The value of @code{sqrt(@var{x}*@var{x} + @var{y}*@var{y})}.  If both
arguments are finite, but the result is so large that it would overflow
a @code{double}, the return value is @code{Inf}, and @code{errno} is set
to @code{ERANGE}.  If one of the arguments is @code{Inf}, the return
value is @code{Inf} and the value of @code{errno} is left unchanged.  If
one of the arguments is @code{NaN}, the return value is @code{NaN} and
@code{errno} is set to @code{EDOM}.

@subheading Portability

@portability !ansi, !posix