whats new ¦  programming tips ¦  indy articles ¦  intraweb articles ¦  informations ¦  links ¦  interviews
 misc ¦  tutorials ¦  Add&Win Game

Tips (1547)

Database (90)
Files (137)
Forms (107)
Graphic (115)
IDE (21)
Indy (5)
Internet / LAN (131)
IntraWeb (0)
Math (76)
Misc (127)
Multimedia (45)
Objects/
ActiveX (51)

OpenTools API (3)
Printing (35)
Strings (83)
System (268)
VCL (243)

Top15

Tips sort by
component


Search Tip

Add new Tip

Add&Win Game

Advertising

38 Visitors Online


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

Tip Rating (47):  
     


{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;




 

Rate this tip:

poor
very good


Copyright © by SwissDelphiCenter.ch
All trademarks are the sole property of their respective owners