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)
    Edit1: TEdit;
    Label1: TLabel;
    Button1: TButton;
    Label2: TLabel;
    Edit2: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  f:Real;            //定义变量
  t,k:Integer;
begin
  t:=StrToInt(Edit1.Text); //将字符串转换成整型数据赋值给t
  k:=t div 500;            //整除
  Case k of                //多分支Case语句
    0:f:=t*0.5/100;   //当收入在0~499元时，交0.5%的会费
    1:f:=t*1/100;
    2,3:f:=t*1.5/100;
    else
      f:=t*2/100;
  end;
  Edit2.Text:=FloatToStr(f);//将实型数据转换成字符串赋值给Edit2.Text
end;

end.