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 hypotl()                Calclulate Long Double Hypotenuse

 #include   <math.h>
 #include   <errno.h>

 long double hypotl(x, y);
 long double x;         First side of triangle
 long double y;         Second side of triangle

    This is the long double-precision version of hypot(); it calulates
    the long double precision floating point value of the hypotenuse
    of a right triangle whose sides are x and y. See hypot() for
    more information.

    Returns:    The hypotenuse; _LHUGE_VAL if overflow.

 Portability:   Not supported by the ANSI standard.