基础问题（新手）

[BUG新手]

unit Unit1;

interface

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

type
TForm1 = class(TForm)
Edit1: TEdit;
Edit2: TEdit;
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
I:Integer;
S:String;
Mystring:array[0..100] of char;
C:array[0..100] of string;
begin
S:=edit1.Text;
I:=Length(S);
ShowMessage(S);
While I>0 do
Begin
C[I]:=UpperCase(MyString[I]);
I:=I-1;

// ShowMessage(c[I]);
End;
edit2.Text:=C[I];

end;




procedure TForm1.Button2Click(Sender: TObject);
begin
close;
end;

end.
这是一个将字符串中的所有字符变成大写的程序，结果什么也没出来，请那位高手帮帮忙，谢了

[yangjiexi]

自己坐在电脑旁好好想想吧！多试一试，很太简单的！

[hezhiwenyy2008]

我不会,不过我也帮你顶一下

[cenjoyer]

把那个C定义成string类型
或者在
edit2.text:=C[I]
上加一个循环