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     The hypot function calculates the length of the hypotenuse of a
     right triangle, given the length of the two sides <x> and <y>. A
     call to hypot is equivalent to the following:
 
          sqrt( x * x + y * y );
 
     The hypotl function uses the 80-bit long double form of arguments
     and return values. In all other respects, it is identical to the
     regular function.
 
     Return Value
 
     These functions return the length of the hypotenuse. If an
     overflow results, hypot returns HUGE_VAL and sets errno to ERANGE.
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