freepascal.compiler/docs/crtex/ex9.pp

Program Example9;
uses Crt;

{ Program to demonstrate the ClrEol function. }
var
  I,J : integer;
  
begin
  For I:=1 to 15 do
    For J:=1 to 80 do
      begin
      gotoxy(j,i);
      Write(j mod 10);
      end;
  Window(5,5,75,12); 
  Write('This line will be cleared from',
        ' here till the right of the window');
  GotoXY(27,WhereY);
  ReadKey;
  ClrEol;
  WriteLn;
end.