while 迴圈

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    procedure Label1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Label1Click(Sender: TObject);
var
    sum,i:Integer;
begin
        sum:=0;
        i:=0;
        while i<=100 do
        begin
            sum:=sum+i;
            i:=i+1;
        end;
        Label1.Caption:=inttostr(sum);
end;

end.
 

Repeat ...until之和

procedure TForm1.Label1Click(Sender: TObject);
var
    sum,i:Integer;
begin
        sum:=0;
        i:=0;

        repeat
            sum:=sum+i;
            i:=i+1;
        Until(i>100);
        Label1.Caption:=inttostr(sum);
end;

end.

 for 迴圈：

procedure TForm1.Label1Click(Sender: TObject);
var
    sum,i:Integer;
begin
        sum:=0;
        i:=0;

        for i:=1 to 100 do
           sum:=sum+i;
        Label1.Caption:=inttostr(sum);
end;

end.