为什么StrToInt没能得到小弟我输的数字，求大神

为什么StrToInt没能得到我输的数字，求大神
unit Unit1;

interface

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

type
  RArray = array[0..1] of Integer; //定义一个数组
  TForm1 = class(TForm)
  Edit1: TEdit;
  Edit2: TEdit;
  Label1: TLabel;
  Label2: TLabel;
  Button1: TButton;

  procedure GetR(R: RArray);
  procedure Button1Click(Sender: TObject);
  private
  { Private declarations }
  public
  { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
procedure TForm1.GetR(R: RArray);
begin
  R[0] := StrToInt(Edit1.Text);
  R[1] := StrToInt(Edit2.Text);
end;


procedure TForm1.Button1Click(Sender: TObject);
var
  R: RArray;
begin
  GetR(R);
  Label1.Caption := IntToStr(R[0]); //这边输出的结果跟我输的就不一样
  Label2.Caption := IntToStr(R[1]);
end;

end.

------解决方案--------------------
procedure TForm1.GetR(R: RArray);
改成
procedure TForm1.GetR(var R: RArray);
即可