Standard Data Type Limits

Source: https://www.freebasic.net/wiki/wikka.php?wakka=TblVarTypes
Last revised: 2024-03-08

Standard variable types and limits.

Numeric Types

Type	Size in bits	Format	Minimum Value	Maximum Value	Literal Suffix	Sig. Digits
BYTE	8	signed integer	-128	+127		2+
UBYTE	8	unsigned integer	0	+255		2+
SHORT	16	signed integer	-32768	+32767		4+
USHORT	16	unsigned integer	0	65535		4+
LONG	32	signed integer	-2147483648	+2147483647	&, l	9+
ULONG	32	unsigned integer	0	+4294967295	ul	9+
INTEGER	32/64 [*]	signed integer	[*]32bit: -2147483648, 64bit: -9223372036854775808	[*]32bit: +2147483647, 64bit: +9223372036854775807	%	[*]
UINTEGER	32/64 [*]	unsigned integer	0	[*]32bit: +4294967295, 64bit: +18446744073709551615	u	[*]
LONGINT	64	signed integer	-9223372036854775808	+9223372036854775807	ll	18+
ULONGINT	64	unsigned integer	0	+18446744073709551615	ull	19+
SINGLE	32	floating point	[**]+/-1.401 298 E-45	[**]+/-3.402 823 E+38	!, f	6+
DOUBLE	64	floating point	[**]+/-4.940 656 458 412 465 E-324	[**]+/-1.797 693 134 862 316 E+308	#, d	15+
enums	32/64 [*]	signed integer	[*]32bit: -2147483648, 64bit: -9223372036854775808	[*]32bit: +2147483647, 64bit: +9223372036854775807		[*]

[*] Integer and UInteger data types vary with platform, matching the size of pointers.
[**] The minimum and maximum values for the floating-point types Single and Double are, respectively, the values closest to zero and the values closest to positive and negative infinity.

String Types

Type	Character Size (in bytes)	Minimum Size (in characters)	Maximum Size (in characters), including terminating padding	Literal Suffix
String	1	0	[**]32bit: +2147483647, 64bit: +9223372036854775807	$
String*N	1	1	[,*]+2147483647	$
Zstring*N	1	1	[,*]+2147483647	[N/A]
Wstring*N	[*]	[*]1	[,,]+2147483647	[N/A]

[*] Unicode, or "wide", characters vary in both size and availability with platform.
[**] All runtime library string procedures take and produce Integer values for sizes and positions. The actual maximum size will vary (smaller) with storage location and/or platform.
[***] Before fbc version 1.20.0, fixed-length strings had the same maximum size limits as variable strings.

Boolean Type

Type	Internal size in bits	Value
Boolean	1-bit wide data (in a Byte)	'False' or 'True'

Arrays

Platform	Maximum Subscript Range	Maximum Elements per Dimension	Minimum/Maximum Dimensions	Maximum Size (in bytes)
32bit	[*][-2147483648, +2147483647]	[*]+2147483647	1/8	[*]+2147483647
64bit	[*][-9223372036854775808, +9223372036854775807]	[*]+9223372036854775807	1/8	[*]+9223372036854775807

[*] All runtime library array procedures take and produce Integer values for subscripts and indexes. The actual limits will vary (smaller) with the number of dimensions, element size, storage location and/or platform.

UDTs

Platform	Maximum Size (in bytes)
32bit	[*]+2147483647
64bit	[*]+2147483647

[*] The actual maximum size will vary (smaller) with storage location and/or platform.

See also

Usage of suffixes for variables

Usage of suffixes for literals / numbers

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