(* decimal representaton of negative powers of 2 *)

const n=10;

type digit  = 0..9;
     digtyp = array[1..n] of digit;

var i,k,r: integer;
    d : digtyp;

begin for k:=1 to n do
   begin put#0('.'); r:=0;
      for i:=1 to k-1 do
      begin r:=10*r+d[i]; d[i]:=r/2;
            r:=r-2*d[i]; put#0(d[i]+'0')
      end;
      d[k]:=5; put#0('5',13,10)
   end
end.