{
 Fibonacci integers are defined as:
 fib[n+2] = fib[n+1] + fib[n];
 fib[1] = 1;
 fib[0] = 1;
 Example/Beispiel: fib[4] = fib[3] + fib[2] = fib[2] + fib[1] + fib[1] + fib[0] =
  fib[1] + fib[0] + fib[1] + fib[1] + fib[0] = 5
}
function fibit(n: Integer): Integer;
var
 a, b, i, temp: Integer;
begin
 temp := 1;
 a := 1;
 b := 1;
 for i := 1 to n - 1 do
 begin
  temp := a + b;
  a := b;
  b := temp;
 end;
 Result := temp;
end;
function fibrec(n: Integer): Integer;
var
 temp: Integer;
begin
 temp := 0;
 if (n = 0) then temp := 1;
 if (n = 1) then temp := 1;
 if (n > 1) then temp := fibrec(n - 1) + fibrec(n - 2);
 Result := temp;
end;

// Example:
procedure TForm1.Button1Click(Sender: TObject);
begin
 ShowMessage(IntToStr(fibit(10)));
 ShowMessage(IntToStr(fibrec(10)));
end;