unit1.pas

本光盘是《Delphi 7应用教程》一书的配套光盘

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    RadioGroup1: TRadioGroup;
    Button1: TButton;
    Memo1: TMemo;
    BitBtn1: TBitBtn;
    Button2: TButton;
    procedure FormCreate(Sender: TObject);
    procedure RadioGroup1Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  RadioGroup1.Items.Add('1-19岁'); //添加单选按钮
  RadioGroup1.Items.Add('20-39岁');
  RadioGroup1.Items.Add('40-59岁');
  RadioGroup1.Items.Add('60-79岁');
  RadioGroup1.Items.Add('80-99岁');
end;

procedure TForm1.RadioGroup1Click(Sender: TObject); //把选中的单选按钮的标题显示在Memo组件中
begin
  Memo1.Clear ;//清除Memo组件中的内容
   Memo1.Lines.Add('你属于'+RadioGroup1.Items[RadioGroup1.ItemIndex]+'组');
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Application.Terminate;   //关闭程序
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  RadioGroup1.Enabled:=False; //让单选按钮组不可用
end;

end.