Convert a number to text

Problem/Question/Abstract:

How to convert a number to text?

Answer:

Here a code to covert a Number (Real) to string:

function RealToTxt(Amount: Real): string;
var
  Num: LongInt;
  Fracture: Integer;

  function Num2Str(Num: LongInt): string;
  const
    hundred = 100;
    thousand = 1000;
    million = 1000000;
    billion = 1000000000;
  begin
    if Num >= billion then
      if (Num mod billion) = 0 then
        Num2Str := Num2Str(Num div billion) + ' Billion'
      else
        Num2Str := Num2Str(Num div billion) + ' Billion ' +
          Num2Str(Num mod billion)
    else if Num >= million then
      if (Num mod million) = 0 then
        Num2Str := Num2Str(Num div million) + ' Million'
      else
        Num2Str := Num2Str(Num div million) + ' Million ' +
          Num2Str(Num mod million)
    else if Num >= thousand then
      if (Num mod thousand) = 0 then
        Num2Str := Num2Str(Num div thousand) + ' Thousand'
      else
        Num2Str := Num2Str(Num div thousand) + ' Thousand ' +
          Num2Str(Num mod thousand)
    else if Num >= hundred then
      if (Num mod hundred) = 0 then
        Num2Str := Num2Str(Num div hundred) + ' Hundred'
      else
        Num2Str := Num2Str(Num div hundred) + ' Hundred ' +
          Num2Str(Num mod hundred)
    else
      case (Num div 10) of
        6, 7, 9: if (Num mod 10) = 0 then
            Num2Str := Num2Str(Num div 10) + 'ty'
          else
            Num2Str := Num2Str(Num div 10) + 'ty-' +
              Num2Str(Num mod 10);
        8: if Num = 80 then
            Num2Str := 'Eighty'
          else
            Num2Str := 'Eighty-' + Num2Str(Num mod 10);
        5: if Num = 50 then
            Num2Str := 'Fifty'
          else
            Num2Str := 'Fifty-' + Num2Str(Num mod 10);
        4: if Num = 40 then
            Num2Str := 'Forty'
          else
            Num2Str := 'Forty-' + Num2Str(Num mod 10);
        3: if Num = 30 then
            Num2Str := 'Thirty'
          else
            Num2Str := 'Thirty-' + Num2Str(Num mod 10);
        2: if Num = 20 then
            Num2Str := 'Twenty'
          else
            Num2Str := 'Twenty-' + Num2Str(Num mod 10);
        0, 1: case Num of
            0: Num2Str := 'Zero';
            1: Num2Str := 'One';
            2: Num2Str := 'Two';
            3: Num2Str := 'Three';
            4: Num2Str := 'Four';
            5: Num2Str := 'Five';
            6: Num2Str := 'Six';
            7: Num2Str := 'Seven';
            8: Num2Str := 'Eight';
            9: Num2Str := 'Nine';
            10: Num2Str := 'Ten';
            11: Num2Str := 'Eleven';
            12: Num2Str := 'Twelve';
            13: Num2Str := 'Thirteen';
            14: Num2Str := 'Fourteen';
            15: Num2Str := 'Fifteen';
            16: Num2Str := 'Sixteen';
            17: Num2Str := 'Seventeen';
            18: Num2Str := 'Eightteen';
            19: Num2Str := 'Nineteen'
          end
      end
  end {Num2Str};

begin
  Num := Trunc(Amount);
  Fracture := Round(1000 * Frac(Amount));
  if Num > 0 then
    Result := Num2Str(Num) + ' and ';
  if Fracture > 0 then
    Result := Result + IntToStr(Fracture) + '/1000'
  else
    Result := Result + '000/1000';
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  form1.Caption := realtotxt(123);
end;