Title: How to check for valid amount
function isValidAmount(sData: string): Boolean;
var
nAmtlen: Smallint; // used to find the length of amount field
nNodots: Smallint; // used to find how many dots are in amount field
begin
nNodots := 0;
Result := False;
for nAmtlen := 1 to Length(sData) do
begin
case sData[nAmtlen] of
'0'..'9': Result := True; // checking for numbers only
'.': nNodots := nNodots + 1;
// incrementing nnodots variable when ever '.' is found
end;
end;
if (Pos('.', sData) = 0) then
begin
if (Length(IntToStr(StrToInt(sData))) 5) then
Result := False
else
Result := True;
end
else
begin
if Pos('.', sData) 6 then
Result := False;
if Length(Copy(sData, (Pos('.', sData) + 1), Length(sData))) 2 then
Result := False;
end;
if ((Result = True) and (nNodots = 1)) then
// checking field contains numbers and only one '.' separator
Result := True
else
Result := False;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if not isValidAmount(trim(Edit1.Text)) then
ShowMessage(Edit1.Text + ' is not a Valid Amount');
else
ShowMessage('Valid Amount');
end;