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 atan2l()                Calculate Long Double ArcTangent of y/x

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

 long double atan2l(y, x);
 long double x                  Long double
 long double y                  Long double

    This is the long double-precision version of atan2(); it returns
    the long double arctangent of y/x. See atan2() for more
    information.

    Returns:    Actangent of x, 0 if x or y is 0.

 Portability:   Not supported by the ANSI standard.