Delphi basic data type (built-in data types)

classification				range	byte	Remark
Simple type	Ordinal	Integer	Integer	-2147483648 .. 2147483647	4	Signed 32
			Cardinal	0 .. 4294967295	4	Unsigned 32-bit
			Shortint	-128 .. 127	1	Signed 8
			Smallint	-32768 .. 32767	2	Signed 16
			Longint	-2147483648 .. 2147483647	4	Signed 32
			Int64	-263 .. 263	8	Signed 64
			Byte	0 .. 255	1	Unsigned 8
			Word	0 .. 65535	2	Unsigned 16
			Longword	0 .. 4294967295	4	Unsigned 32-bit
		character	AnsiChar (Char)	ANSI character set		8th
			WideChar	Unicode character set		# 16
		Boolean	Boolean	False < True Ord(False) = 0 Ord(True) = 1 Succ(False) = True Pred(True) = False	1
			ByteBool	False <> True Ord(False) = 0 Ord(True) <> 0 Succ(False) = True Pred(False) = True	1
			WordBool		2
			LongBool		4
		enumerate
		Child world
	Real		Real	5.0×10-324 .. 1.7×10308	8	[Accuracy] 15..16
			Real48	2.9×10-39 .. 1.7×1038	6	[The precision] 11..12; backward compatibility
			Single	1.5×10-45 .. 3.4×1038	4	[Accuracy] 7..8
			Double	5.0×10-324 .. 1.7×10308	8	[Accuracy] 15..16
			Extended	3.6×10-4951 .. 1.1×104932	10	[Accuracy] 19..20
			Comp	-263 + 1 .. 263 - 1	8	[Accuracy] 19..20
			Currency	-922337203685477.5808 ..  922337203685477.5807	8	[精度]19..20
字符串			ShortString	255个字符	2..256B	向后兼容
			AnsiString	大约 231 个字符	4B..2GB	8位(ANSI)字符
			WideString	大约 230 个字符	4B..2GB	多用户服务和 多语言应用程序;  和com定义的BSTR兼容
			其他	String String[0..255] PChar PAnsiString PWideString
结构类型	集合		Set	最多256个元素[0..255]
	数组	静态数组
		动态数组
	记录		Record
	文件		File
	类		Class
	类引用		Class reference
	接口		Interface
指针类型	无类型指针		Pointer
	有类型指针	预定义类型指针	PAnsiString PString PByteArray PCurrency PDouble PExtended PSingle PInteger POleVariant PShortString PTextBuf PVarRec PVariant PWideString PWordArray
过程类型	程序过程类型		Procedural
	对象过程类型		Procedural
变体类型			Variant
			OleVariant