not 与整数

//Byte
procedure TForm1.Button1Click(Sender: TObject);
var
  x,y: Byte;
begin
  x := MAXBYTE;  //MAXBYTE是常数255
  y := not x;  //y 的值是 0

  x := 5;
  y := not x;  //y 的值是 250
  ShowMessage(IntToStr(y));
end;

//Word
procedure TForm1.Button1Click(Sender: TObject);
var
  x,y: Word;
begin
  x := MAXWORD;  //MAXBYTE是常数65535
  y := not x;  //y 的值是 0

  x := 5;
  y := not x;  //y 的值是 65530
  ShowMessage(IntToStr(y));
end;

//Cardinal
procedure TForm1.Button1Click(Sender: TObject);
var
  x,y: Cardinal;
begin
  x := 4294967295;  //Cardinal 类型的最大值
  y := not x;  //y 的值是 0

  x := 5;
  y := not x;  //y 的值是 4294967290
end;

//Integer
procedure TForm1.Button1Click(Sender: TObject);
var
  x,y: Integer;
begin
  x := MaxInt;  //MAXInt是常数2147483647
  y := not x;  //y 的值是 -2147483648, 也就是Integer的最小值

  x := 5;
  y := not x;  //y 的值是 -6

  y := not x + 1;  //y 的值是 -5
end;