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...check if a String is numeric?
Autor: Simon Grossenbacher
Homepage: http://www.swissdelphicenter.ch
[ Print tip ]  

Tip Rating (61):  
     


{1.}

function IsStrANumber(const S: string): Boolean;
var
  
P: PChar;
begin
  
P      := PChar(S);
  Result := False;
  while P^ <> #0 do
  begin
    if not 
(P^ in ['0'..'9']) then Exit;
    Inc(P);
  end;
  Result := True;
end;

{2.}

function IsStrANumber(const S: string): Boolean;
begin
  
Result := True;
  try
    
StrToInt(S);
  except
    
Result := False;
  end;
end;

// Example:

procedure TForm1.Button1Click(Sender: TObject);
begin
  if 
IsStrANumber(edit1.Text) = True then
    
ShowMessage('String contains only numbers!');
end;




 

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