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;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    procedure Button4Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button4Click(Sender: TObject);
var
  t:Integer;                   //声明t为整型变量
begin
  t:=StrToInt(Edit1.Text);     //字符串转换成整型数据再赋值给t
  Label5.Caption:=IntToStr(t div 1000); //div表示整数除法，求千位上的数字
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  t:Integer;
begin
  t:=StrToInt(Edit1.Text);
  Label4.Caption:=IntToStr((t mod 1000) div 100); //求百位上的数字
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  t:Integer;
begin
  t:=StrToInt(Edit1.Text);
  Label3.Caption:=IntToStr((t mod 100)div 10);//求十位上的数字
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  t:Integer;
begin
  t:=StrToInt(Edit1.Text);
  Label2.Caption:=IntToStr(t mod 10);//求个位上的数字
end;

end.