Delphi ¹Ø¼ü×ÖÏê½â

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Delphi ¹Ø¼ü×ÖÏê½â
absolute
//ËüʹµÃÄãÄܹ»´´½¨Ò»¸öбäÁ¿, ²¢ÇҸñäÁ¿µÄÆðʼµØÖ·ÓëÁíÒ»¸ö±äÁ¿Ïàͬ.
var
  Str: string[32];
  StrLen: Byte absolute Str;
//Õâ¸öÉùÃ÷Ö¸¶¨Á˱äÁ¿StrLenÆðʼµØÖ·ÓëStrÏàͬ.
//ÓÉÓÚ×Ö·û´®µÄµÚ0¸öλÖñ£´æÁË×Ö·û´®µÄ³¤¶È, ËùÒÔStrLenµÄÖµ¼´×Ö·û´®³¤¶È.
begin
  Str := 'abc';
  Edit1.Text := IntToStr(StrLen);
end;
abstract
//ËüÔÊÐíÄã´´½¨³éÏóµÄ·½·¨, °üÀ¨ÓгéÏó·½·¨µÄÀà³ÆΪ³éÏóÀà.
//Abstract¹Ø¼ü×Ö±ØÐëÓëVirtual»òDynamic¹Ø¼ü×ÖͬʱʹÓÃ, ÒòΪ³éÏó·½·¨±ØÐë±»¸²¸ÇʽʵÏÖ.
//³éÏóÀ಻ÄÜʵÀý»¯, ³éÏó·½·¨²»ÄÜ°üº¬·½·¨Ìå.
type
  TDemo = class
    private
    protected
      procedure X; virtual; abstract;
    public
      constructor Create;
      destructor Destroy; override;
    published
  end;
and
//Ò»¡¢±íʾÂß¼­Óë
if (a>0) and (b>0) then
//¶þ¡¢±íʾλÔËËã
var
  a,b,c: Integer;
begin
  c := (a and b);
end;
//ʹÓÃAnd±íʾÂß¼­Ê±, And×óÓҵıí´ïʽ±ØÐëÓÃСÀ¨ºÅÀ¨Æð, ÒÔ±ÜÃâÒÔÉúÌõ¼þµÄ³åÍ».
//ÀýÈç:
if a>0 and b>0 then
//±àÒëÆ÷¿ÉÄÜ»áÀí½âΪ:
if a>(0 and b)>0 then
//»ò:
if (a>0) and (b>0) then
//µ«ÊÇʵ¼Ê±àÒëʱ, ±àÒëÆ÷»á²úÉúÒ»¸ö³åÍ», ±¨¸æ´íÎó.
//²¢ÇÒµÚÒ»ÖÖ¿ÉÄÜ°üº¬ÁËa>b>cµÄÐÎʽ, ÕâÔÚDelphiÖв»±»Ö§³Ö.
//ËùÒÔʹÓÃAndÔËËã·ûʱ±ØÐëʹÓÃÀ¨ºÅ, ÒÔÇø·Ö×óÓÒµÄÌõ¼þ.
//±íʾλÔËËãʱҲ±ØÐë¼ÓÉÏÀ¨ºÅ, ½«AndÒÔ¼°×óÓÒ²ÎÊýÀ¨Æð.
array
//ArrayÓÃÓÚ±íʾÊý×é, ÈκεĶÔÏó¶¼Äܱ»ÉùÃ÷³ÉÊý×é.Êý×é·ÖΪ¾²Ì¬ºÍ¶¯Ì¬µÄ£²ÖÖ.
//¾²Ì¬Êý×é
var
  Arr1: array [1..10] of Integer;
//¶¯Ì¬Êý×é, ÓÉÓÚÉùÃ÷ʱ²»ÖªÆäÔªËظöÊý, ËùÒÔ±ØÐëÔÚºóÆÚÓÃSetLength·½·¨ÉèÖÃÊý×éµÄ´óС
var
  Arr2: array of Integer;
//Êý×é×÷Ϊ²ÎÊýʱ, ²»ÄÜ´«ÈëÊý×éµÄ´óС, Ö»ÄÜ´«ÈëÊý×éÃû, È»ºóÓÃLength·½·¨»ñÈ¡Êý×éµÄÔªËظöÊý
function X(A: array of Integer): Integer;
var
 i: Integer;
begin
  Result := 0;
  for i := 0 to Length(A)-1 do