{Clrdevc.PAS}
  ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
  {Sample code for the ClearDevice procedure.}

  uses Crt, Graph;

  var Gd, Gm: Integer;
  begin
    Gd := Detect;
    InitGraph(Gd, Gm, '');
    if GraphResult <> grOk then
      Halt(1);
    Randomize;
    repeat
      LineTo(Random(200), Random(200));
    until KeyPressed;
    ClearDevice;
    Readln;
    CloseGraph;
  end.