unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    procedure
 
 Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation
 


{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  c: Char;
  b: BOOL;
begin
  c := #65; {A}
  b := IsCharAlpha(c);
  ShowMessage(BoolToStr(b, True)); {True}
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  c: Char;
  b: BOOL;
begin
  c := #97
 
; {a}
  b := IsCharAlpha(c);
  ShowMessage(BoolToStr(b, True)); {True}
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  c: Char;
  b: BOOL;
begin
  c := #48; {0}
  b := IsCharAlpha(c);
  ShowMessage(BoolToStr(b, True)); {False}
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  c: Char;
  b: BOOL;
begin
  c := #13; {回車鍵}
  b := IsCharAlpha(c);
  ShowMessage(BoolToStr(b, True)); {False}
end;

procedure TForm1.Button5Click(Sender: TObject);
var
  c: WideChar;
  b: BOOL;
begin
  c := #19975; {萬}
  b := IsCharAlpha(c);
  ShowMessage(BoolToStr(b, True)); {False}
end;

end.