[eichin:19960613.2313PDT] exercise 2.2

package Simple_Maths is
  function Sqrt(X: in Float) return Float;
  function Log(X: in Float) return Float;
  function Ln(X: in Float) return Float;
  function Exp(X: in Float) return Float;
  function Sin(X: in Float) return Float;
  function Cos(X: in Float) return Float;
end Simple_Maths;

add to print_Roots a "use Simple_Maths" and "with Simple_Maths"
or just write Simple_Maths.Sqrt() explicitly.