unit1.pas

这有很多Delphi应用的例子

unit Unit1;

interface

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

type
  TForm2 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Label7: TLabel;
    Label8: TLabel;
    Label10: TLabel;
    Label11: TLabel;
    Label13: TLabel;
    Button1: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Label9: TLabel;
    Label12: TLabel;
    Label14: TLabel;
    Label15: TLabel;
    Label16: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
var
      ValInteger:Integer;
      Errcode:Integer;
      HelpStr:String;
begin
      HelpStr:=Label2.Caption;
      Delete(HelpStr,StrtoInt(Label13.Caption),StrtoInt(Label14.Caption));
      Edit1.Text:=HelpStr;
      HelpStr:=Label2.Caption;
      Insert(Label4.Caption,HelpStr,StrtoInt(Label13.Caption));
      Edit2.Text:=HelpStr;
      Str(StrtoInt(Label15.Caption),HelpStr);
      Edit3.Text:=HelpStr;
      Val(Label16.Caption,ValInteger,Errcode);
      Edit4.Text:=InttoStr(ValInteger);
end;


end.