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 hypot()                 Calculate the Hypotenuse of a Right Triangle

 #include   <math.h>

 double     hypot(x,y);
 double     x,y:                         Floating-point values

    hypot() returns the length of the hypotenuse of the right triangle
    with sides of length 'x' and 'y'.  This is the equivalent of:

                       sqrt('x' * 'x' + 'y' * 'y');

    Returns:    The length of the hypotenuse.  On overflow, matherr() is
                called with an overflow error, 'errno' (defined in
                <stdlib.h>) is set to ERANGE (defined in <math.h>), and
                the value 'HUGE_VAL' (defined in <math.h>) is returned.

      Notes:    Error handling can be modified by using the matherr()
                routine.

 Portability:   Not supported by ANSI standard.

   -------------------------------- Example ---------------------------------

    The following statements calculate the length of the hypotenuse of a
    right triangle with two sides of length 7.0 and 24.0:

           #include <math.h>     /* for hypot() */

           main()
           {
               double h;

               h = hypot(7.0, 24.0);    /* h = 25.0 */
           }