unit1.pas

operation system homework

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    Panel1: TPanel;
    Panel2: TPanel;
    Panel3: TPanel;
    Button1: TButton;
    Edit1: TEdit;
    Button2: TButton;
    Edit2: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure ListBox1Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  i: integer; //i是判断变量
  x: integer; //x为引用率
  y: integer; //y为不需置换数

implementation

{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
i:=1;
x:=0;
y:=0;
end;

procedure TForm1.ListBox1Click(Sender: TObject);
begin
  if (panel1.Caption=listbox1.Items[listbox1.ItemIndex])or(panel2.Caption=listbox1.Items[listbox1.ItemIndex])or(panel3.Caption=listbox1.Items[listbox1.ItemIndex])
  then y:=y+1
  else
begin
  if i mod 3=1
  then
  begin
    panel1.Caption:=listbox1.Items[listbox1.ItemIndex];
    i:=i+1;
  end
  else
    begin
      if i mod 3=2
      then
      begin
        panel2.Caption:=listbox1.Items[listbox1.ItemIndex];
        i:=i+1;
      end
      else
        begin
        if i mod 3=0
        then
          begin
            panel3.Caption:=listbox1.Items[listbox1.ItemIndex];
            i:=i+1;
          end
        end;
    end;
    end;
    x:=x+1;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
edit1.Text:=inttostr(x);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
edit2.Text:=inttostr(x-y);
end;

end.