(* Compute a table of exact fractions 1/2, 1/3. ... , 1/64.
   If  the fraction has a period, print an apostrophe in front
   of its first digit and truncate after its last digit. *)

MODULE fractions;
FROM InOut IMPORT Write, WriteLn, WriteString, WriteCard;
(* fractions to the base b *)

CONST Base = 10;
      N = 32;

VAR i,j,m,rem: CARDINAL;
    d: ARRAY [1..N] OF CARDINAL; (* digits *)
    x: ARRAY [0..N] OF CARDINAL; (* index  *)
BEGIN
  FOR i := 2 TO N DO
    FOR j := 0 TO i-1 DO x[j] := 0 END;
    m := 0; rem := 1;
    REPEAT
      m:= m+1; x[rem] := m;
      rem := Base*rem;
      d[m] := rem DIV i;
      rem := rem MOD i;
    UNTIL x[rem] # 0;
    WriteCard(i,6); WriteString(' 0.');
    FOR j := 1 TO x[rem]-1 DO Write(CHR(d[j]+ORD('0'))) END;
    Write("'");
    FOR j := x[rem] TO m DO Write(CHR(d[j]+ORD('0'))) END;
    WriteLn;
  END
END fractions.