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`hypot', `hypotf'--distance from origin

     #include <math.h>
     double hypot(double X, double Y);
     float hypotf(float X, float Y);
`hypot' calculates the Euclidean distance `sqrt(X*X + Y*Y)' between the
origin (0,0) and a point represented by the Cartesian coordinates
(X,Y).  `hypotf' differs only in the type of its arguments and result.
Normally, the distance value is returned.  On overflow, `hypot' returns
`HUGE_VAL' and sets `errno' to `ERANGE'.
   You can change the error treatment with `matherr'.
`hypot' and `hypotf' are not ANSI C.