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 powl()                  Calculate Long Double X Raised to the Yth Power

 #include   <math.h>

 long double powl(x, y);
 long double x;
 long double y;

    This is the long double precision version of pow(); it raises
    x to the yth power and returns the long double result. See pow()
    for more information.

                                y
    Returns:    If successful, x ; otherwise, 0 or ._LHUGE_VAL.

 Portability:   Not supported by the ANSI standard.