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Frequently Asked Questions

How can I test if a given string contains a valid number?

Question:

How can I test if a given string contains a valid number?

Answer:

Use one of the string to number function inside a try except block,
and test for an exception.

Example:

function IsStrANumber(NumStr : string) : bool;
begin
  result := true;
  try
    StrToInt(NumStr);
  except
    result := false;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if IsStrANumber(Edit1.Text) then
    ShowMessage(Edit1.Text) else
    ShowMessage('Not a Number');
end;

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