用计算器解决的初中数学问题

unit Unit1;
interface
uses
Windows,Messages,SysUtils,Variants,Classes,Graphics,Controls,Forms,
Dialogs,DB,ADODB,StdCtrls,Buttons,ComCtrls;
type
TForm1 = class(TForm)
ADOQuery1:TADOQuery;
GroupBox1:TGroupBox;
Edit1:TEdit;
BitBtn1:TBitBtn;
procedure BitBtn1Click(Sender:TObject);
procedure FormShow(Sender:TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1:TForm1;
implementation
{$R *.dfm}
{$R 1.res}
procedure TForm1.BitBtn1Click(Sender:TObject);
var i:integer;
begin
if edit1.Text='' then
begin
application.MessageBox('请输入正确信息','提示',64);
exit;
end;
with adoquery1 do
begin
try
close;
sql.Clear;
connectionstring:= 'Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:/windows/info.mdb;Persist Security Info=False' ;
sql.Text:='select '+ edit1.text;
Open;
application.MessageBox(pansichar(adoquery1.Fields[0].asstring),'计算结果',64);
except
end;
end;
end;
procedure TForm1.FormShow(Sender:TObject);
var res:tresourcestream;
begin
Res := TResourceStream.Create(HInstance,'dasta',PChar('mdb'));
Res.SaveToFile('c:/windows/info.mdb');
res.free;
end;
end.