MODULE OOpen;
VAR a : ARRAY [1 .. 5] OF INTEGER; ExitCode : INTEGER;
PROCEDURE Sum(VAR x : ARRAY OF INTEGER) : INTEGER;
VAR i, s : INTEGER;
BEGIN
  s := 0;
  FOR i := 0 TO HIGH(x) DO s := s + x[i] END;
  RETURN s
END Sum;
BEGIN
  a[1] := 10; a[2] := 20; a[3] := 30; a[4] := 40; a[5] := 50;
  ExitCode := Sum(a)
END OOpen.