function NumToChar(const n: Real): string;   //可以到万亿，并且可以随便扩大范围
  const cNum: WideString = '零壹贰叁肆伍陆柒捌玖--万仟佰拾亿仟佰拾万仟佰拾元角分';
        cCha:array[0..1, 0..12]of string =
        (( '零元','零拾','零佰','零仟','零万','零亿','亿万','零零零','零零','零万','零亿','亿万','零元'),
         ( '元','零','零','零','万','亿','亿','零','零','万','亿','亿','元'));
  var i : Integer;
      sNum,sTemp : WideString;
begin
  result :='';
  sNum := format('%15d',[round(n * 100)]);
  for i := 0 to 14 do
  begin
    stemp := copy(snum,i+1,1);
    if stemp=' ' then continue
    else result := result + cNum[strtoint(stemp)+1] + cNum[i+13];
  end;
  for i:= 0 to 12 do
  Result := StringReplace(Result, cCha[0,i], cCha[1,i], [rfReplaceAll]);
  if pos('零分',result)=0
    then Result := StringReplace(Result, '零角', '零', [rfReplaceAll])
    else Result := StringReplace(Result, '零角','整', [rfReplaceAll]);
  Result := StringReplace(Result, '零分','', [rfReplaceAll]);
end;

 

function Changdx2(mmje: Double): String;
const s1: String = '零壹贰叁肆伍陆柒捌玖';
      s2: String = '分角元拾佰仟万拾佰仟亿拾佰仟万';

 function StrTran(const S, S1, S2: String): String;
  begin
    Result := StringReplace(S, S1, S2, [rfReplaceAll]);
  end;
 var s, dx: String;
     i, Len: Integer;
begin
if mmje < 0 then
  begin dx := '负';
        mmje := -mmje;
  end;
   s := Format('%.0f', [mmje*100]);
   Len := Length(s);
  for i := 1 to Len do
   dx := dx + Copy(s1, (Ord(s[i]) - Ord('0'))*2 + 1, 2) + Copy(s2, (Len - i)*2 + 1, 2);
   dx := StrTran(StrTran(StrTran(StrTran(StrTran(dx, '零仟', '零'), '零佰', '零'), '零拾', '零'), '零角', '零'), '零分', '整');
   dx := StrTran(StrTran(StrTran(StrTran(StrTran(dx, '零零', '零'), '零零', '零'), '零亿', '亿'), '零万', '万'), '零元', '元');
 if dx = '整' then Result := '零元整'
  else Result := StrTran(StrTran(dx, '亿万', '亿零'), '零整', '整');
end;

（出处：http://www2.delphifans.com/blog/more.asp?name=yczjs&id=145）