Q(uick)BASIC Data Types: ISAM
Quick View
ISAM Data Types
Information about data types supported with ISAM
Worth knowing
Useful and cross-version information about the programming environments of QBasic and QuickBasic.
Description/Parameter(s)
| Data Type | Size of Data | Range | Indexable |
| INTEGER | 2 bytes, signed | -32,768 to 32,767 | Yes |
| LONG | 4 bytes, signed | -2,147,483,648 to 2,147,483,647 | Yes |
| DOUBLE | 8 bytes | -1.79769313486231D308 to -4.94065D-324 for negatives; 4.94065D-324 to 1.79769313486231D308 for positives |
Yes |
| When compiling with /Fpa: -1.79769313486231D308 to-2.2250738585072D-308 fornegative values; 2.2250738585072D-308 to1.79769313486231D308 forpositive values. |
|||
| CURRENCY | 8 bytes | -922337203685477.5808 to 922337203685477.5807 | Yes |
| STRING | Up to 32K | Only if shorter than 256 bytes | |
| Static Array | 64K | No | |
| User-defined (structure) | 64K | No | |
The data types that can be specified in a TYPE...END TYPE statement are in bold upper-case letters.
- BASIC's SINGLE data type is not supported in ISAM; use DOUBLE or CURRENCY instead.
See also: