Изобразить термометр — Pascal(Паскаль)

uses graph, crt;

var
  gd, gm, y, x: integer;
  pressedkey: char;

label 0, 1, 2;

begin
  initgraph(gd, gm, 'c:\bp\bgi');
  ellipse(320, 240, 360, 0, 28, 200);
  y := 440;
  outtext('Press up arrow key for moving up/down arrow key for moving down');
  outtextxy(1, 10, 'Press Esc to exit');
0:
  pressedkey := readkey;
  if pressedkey = chr(27) then
    halt;
  if ord(pressedkey) = 72 then
    goto 1;
  if ord(pressedkey) = 80 then
    goto 2;
  goto 0;
1:
  x := 320;
  y := y - 2;
  IF y < 45 THEN
    y := 47;
  putpixel(x, y, 13);
  goto 0;
2:
  putpixel(x, y, 0);
  x := 320;
  y := y + 2;
  IF y > 440 THEN
    y := 442;
  putpixel(x, y, 0);
  goto 0;
  repeat
    ;
  until keypressed;
  closegraph;

end.