hypot(3)

NAME
     hypot - Euclidean distance

SYNOPSIS
     #include <math.h>

     double hypot(double x, double y)

DESCRIPTION
     Hypot(x, y) returns sqrt(x*x+y*y) computed in such a way  that  underflow
     will  not  happen,  and overflow occurs only if the final result deserves
     it.

     hypot(Inf, v) = hypot(v, Inf) = +Inf for all v, including NaN.

ERROR (due to Roundoff, etc.)
     Below 1 ulps.  (ulp = Units in the Last Place).

DIAGNOSTICS
     hypot(x, y) = Inf if x or y is +Inf or -Inf.
     hypot(x, y) = NaN if x or y is NaN (but not +Inf).

SEE ALSO
     math(3), sqrt(3).

AUTHOR
     W. Kahan