procedure random_bombs(bnum : integer; l : integer; c : integer);
var
   c_pos : integer;
   l_pos : integer;
   i : integer;
begin
     randomize;
     for i := 1 to bnum do
     begin
          c_pos := random(c) + 1;
          l_pos := random(l) + 1;

          while (field[l_pos, c_pos] = bomba) do
          begin
              c_pos := random(c) + 1;
              l_pos := random(l) + 1;
          end;

          field[l_pos, c_pos] := bomba;
     end;
end; { fim random_bombs }