Fpc, методы класса Опции

[klem4]

Почему я не могу напрямую вызвать метод класса ? ClassName.MethodName ? Просто интересно.

{$N+}
{$mode objfpc}

unit Polinom;

interface

type

  TFloat = Double;

  TCoeff = TFloat;

  TCoeffs = array of TCoeff;

  TPolinom = class

    public

      constructor Create(const n: Word);

      destructor Destroy;

      procedure ReadCoeffs;

      procedure PrintCoeffs(const c: TCoeffs);

      function GetDerivative(const c: TCoeffs): TCoeffs;

      function GetCoeffs: TCoeffs;

      property C: TCoeffs read GetCoeffs;

    private

      coeffs: TCoeffs;

  end;

implementation

constructor TPolinom.Create(const n: Word);
begin
  SetLength(coeffs, n + 1);
end;

destructor TPolinom.Destroy();
begin
  SetLength(coeffs, 0);
end;

function TPolinom.GetCoeffs: TCoeffs;
begin
  result := coeffs;
end;

procedure TPolinom.ReadCoeffs;
var
  i: Integer;
begin
  for i := 0 to Length(coeffs) - 1 do begin
    write('x^', i, ' * ');
    readln(coeffs[i]);
  end;
end;

function TPolinom.GetDerivative(const c: TCoeffs): TCoeffs;
var
  i: Integer;
begin
  SetLength(result, Length(c) - 1);
  for i := Length(c) - 1 downto 1 do
   result [i - 1] := c[i] * i;
end;

procedure TPolinom.PrintCoeffs(const c: TCoeffs);
var
  i: Integer;
begin
  for i := 0 to Length(c) - 1 do
   writeln('c[', i, ']=', c[i]:2:1);
end;

begin
end.

uses Crt, Polinom;

var

  P: TPolinom;

  degree: Integer;

  test: TCoeffs;

begin
  clrscr;


  write('Введите степень полинома : '); readln(degree);

  P := TPolinom.Create(degree);

  P.ReadCoeffs;

  test := P.C;

  TPolinom.PrintCoeffs(test); // <---------------- Вот так нельзя делать ?!

  P.Destroy;

  readln;
end.