Standard Data Type Limits
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:
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