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Delphi source code for Strings >> Validate a float number


Category: Strings
Title: Validate a float number
Date added: 15.03.2006
Hits: 19280


function StrIsReal(AString: string): Boolean;
var
  I: Extended;
  Code: Integer;
begin
  Val(AString, I, Code);
  Result := Code = 0;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Edit1.Text := '123.222';
  if StrIsReal(Edit1.Text) then
    ShowMessage('Valid float number! Gültige Gleitkommazahl!');
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  s: string;
  f: double;
begin
  s := '123.222';
  if TryStrToFloat(s, f) then
    ShowMessage('Ok!')
  else
    ShowMessage('No valid float number!');
end;

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