小弟初学delphi，应书中要求写下一计算器，请童鞋，老是，指教。

Question

本帖最后由 maotao456 于 2011-10-23 01:12:30 编辑

Answer 1

好了，源码我贴出来了， 请大家帮忙解释一下吧。unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, XPMan, StdCtrls;type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Button7: TButton;
    Button8: TButton;
    Button9: TButton;
    Button10: TButton;
    Button11: TButton;
    Button12: TButton;
    Button13: TButton;
    Button14: TButton;
    Button15: TButton;
    Button16: TButton;
    GroupBox1: TGroupBox;
    Edit1: TEdit;
    XPManifest1: TXPManifest;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
    procedure Button8Click(Sender: TObject);
    procedure Button9Click(Sender: TObject);
    procedure Button10Click(Sender: TObject);
    procedure Button11Click(Sender: TObject);
    procedure Button12Click(Sender: TObject);
    procedure Button13Click(Sender: TObject);
    procedure Button14Click(Sender: TObject);
    procedure Button15Click(Sender: TObject);
    procedure Button16Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;
  zhen1:integer;
  zhen2:integer;
  zhen3:integer;
  zhen4:integer;
  wenben:string;
  result:real;
implementation{$R *.dfm}
 function Add(a,b:real):real;
 begin
 add:=a+b;
 end;
 function Sub(a,b:real):real;
 begin
 sub:=a-b;
 end;
 function Mul(a,b:real):real;
 begin
 mul:=a*b;
 end;
 function Exc(a,b:real):real;
 begin
 Exc:=a/b;
 end;
procedure TForm1.Button1Click(Sender: TObject);
begin
    edit1.text:=edit1.text+'1';
end;procedure TForm1.Button2Click(Sender: TObject);
begin
edit1.text:=edit1.text+'2';
end;procedure TForm1.Button3Click(Sender: TObject);
begin
edit1.text:=edit1.text+'3';
end;procedure TForm1.Button4Click(Sender: TObject);
begin
edit1.text:=edit1.text+'4';
end;procedure TForm1.Button5Click(Sender: TObject);
begin
edit1.text:=edit1.text+'5';
end;procedure TForm1.Button6Click(Sender: TObject);
begin
edit1.text:=edit1.text+'6';
end;procedure TForm1.Button7Click(Sender: TObject);
begin
edit1.text:=edit1.text+'7';
end;procedure TForm1.Button8Click(Sender: TObject);
begin
edit1.text:=edit1.text+'8';
end;procedure TForm1.Button9Click(Sender: TObject);
begin
edit1.text:=edit1.text+'9';
end;procedure TForm1.Button10Click(Sender: TObject);
begin
edit1.text:=edit1.text+'0';
end;procedure TForm1.Button11Click(Sender: TObject);
begin
wenben:=edit1.Text;
edit1.Clear;
button12.Enabled:=false;
button13.Enabled:=false;
button14.Enabled:=false;
zhen1:=1;
end;procedure TForm1.Button12Click(Sender: TObject);
begin
wenben:=edit1.Text;
edit1.Clear;
button11.Enabled:=false;
button13.Enabled:=false;
button14.Enabled:=false;
zhen2:=2;
end;procedure TForm1.Button13Click(Sender: TObject);
begin
wenben:=edit1.Text;
edit1.Clear;
button11.Enabled:=false;
button12.Enabled:=false;
button14.Enabled:=false;
zhen3:=3;
end;procedure TForm1.Button14Click(Sender: TObject);
begin
wenben:=edit1.Text;
edit1.Clear;
button11.Enabled:=false;
button12.Enabled:=false;
button13.Enabled:=false;
zhen4:=4;
end;procedure TForm1.Button15Click(Sender: TObject);
begin
if (zhen1=1)and (wenben<>'') then
begin
result:=add(strtofloat(wenben),strtofloat(edit1.text));
edit1.Text:=floattostr(result);
button11.Enabled:=true;
button12.Enabled:=true;
button13.Enabled:=true;
button14.Enabled:=true;end
else if (zhen2=2)and(wenben<>'') then
begin
result:=sub(strtofloat(wenben),strtofloat(edit1.Text));
edit1.Text:=floattostr(result);
button11.Enabled:=true;
button12.Enabled:=true;
button13.Enabled:=true;
button14.Enabled:=true;
end
else if (zhen3=3)and(wenben<>'') then
begin
result:=mul(strtofloat(wenben),strtofloat(edit1.Text));
edit1.Text:=floattostr(result);
button11.Enabled:=true;
button12.Enabled:=true;
button13.Enabled:=true;
button14.Enabled:=true;
end
else if (zhen4=4)and(wenben<>'') then
begin
result:=Exc(strtofloat(wenben),strtofloat(edit1.Text));
edit1.Text:=floattostr(result);
button11.Enabled:=true;
button12.Enabled:=true;
button13.Enabled:=true;
button14.Enabled:=true;
end
else
showmessage('输入有误');
end;procedure TForm1.Button16Click(Sender: TObject);
begin
edit1.Clear;
button11.Enabled:=true;
button12.Enabled:=true;
button13.Enabled:=true;
button14.Enabled:=true;
end;procedure TForm1.FormCreate(Sender: TObject);
begin
edit1.Clear;
end;end.

Answer 2

小技巧：您的procedure TForm1.Button1Click(Sender: TObject);
begin
  edit1.text:=edit1.text+'1';
end;procedure TForm1.Button2Click(Sender: TObject);
begin
edit1.text:=edit1.text+'2';
end;procedure TForm1.Button3Click(Sender: TObject);
begin
edit1.text:=edit1.text+'3';
end;
//....可以简写为：procedure TForm1.Button1Click(Sender: TObject);
begin
   With Sender As TButton do
      edit1.text:=edit1.text+Caption;
end;
然后其他的Button可以共用此代码

Answer 3

很遗憾，你的代码中没有涉及到 Edit 的输入。其实，你可以将 Edit 改为 readonly， 然后处理窗体的键盘消息，将键盘按下的没用的按键值过滤掉，然后在处理到 Edit 中。或者干脆不用 Edit，用 StaticText 来显示用户输入，将会好的多。