简单的delphi考试题 快来帮帮忙啊~~~!!

来源：百度知道 编辑：UC知道 时间：2024/06/05 14:47:38
1、用户在界面上输入一个3位正整数后，按“确定”键，该数字的个位、十位、百位数字分别显示在输出框中。如果输入的数据不在规定范围之内，程序要给出错误提示。

unit Unit1;

interface

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

type
TForm1 = class(TForm)
Edit1: TEdit;
Button1: TButton;
Label1: TLabel;
procedure Edit1KeyPress(Sender: TObject; var Key: Char);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
if not (Key in ['0'..'9']) then
Key := #0;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
str, s: string;
a,b,c: integer;
begin
s := Edit1.Text;
if Length(s) <> 3 then
begin
showmessage('数据长度不为3');