vspeedf.pas

来自「delphi4从入门到精通源代码」· PAS 代码 · 共 85 行

unit VSpeedF;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Label1: TLabel;
    Label2: TLabel;
    ProgressBar1: TProgressBar;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  Total: Variant;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  time1, time2: TDateTime;
  n1, n2: Variant;
begin
  time1 := Now;
  n1 := 0;
  n2 := 0;
  ProgressBar1.Position := 0;
  while n1 < 5000000 do
  begin
    n2 := n2 + n1;
    Inc (n1);
    if (n1 mod 50000) = 0 then
    begin
      ProgressBar1.Position := n1 div 50000;
      Application.ProcessMessages;
    end;
  end;
  // we must use the result
  Total := n2;
  time2 := Now;
  Label1.Caption := FormatDateTime (
    'n:ss', Time2-Time1) + ' seconds';
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  time1, time2: TDateTime;
  n1, n2: Integer;
begin
  time1 := Now;
  n1 := 0;
  n2 := 0;
  ProgressBar1.Position := 0;
  while n1 < 5000000 do
  begin
    n2 := n2 + n1;
    Inc (n1);
    if (n1 mod 50000) = 0 then
    begin
      ProgressBar1.Position := n1 div 50000;
      Application.ProcessMessages;
    end;
  end;
  // we must use the result
  Total := n2;
  time2 := Now;
  Label2.Caption := FormatDateTime (
    'n:ss', Time2-Time1) + ' seconds';
end;

end.