The intrinsic data types are INTEGER, REAL, LOGICAL, COMPLEX, and CHARACTER, whose sizes are shown in the following table.
Data Types and Storage Sizes
| Types | Number of Bytes |
|---|---|
| INTEGER(1), LOGICAL(1), CHARACTER | 1 |
| INTEGER(2), LOGICAL(2) | 2 |
| INTEGER, LOGICAL, REAL | Depending on default integer size (set by the /integer_size
compiler option or equivalent directive) , INTEGER and LOGICAL can have 2, 4,
or 8 bytes; default allocation is 4 bytes.
Depending on default real size (set by the /real_size compiler option or equivalent directive), REAL can have 4 or 8 bytes; default allocation is 4 bytes. |
| INTEGER(4), REAL(4), LOGICAL(4) | 4 |
| INTEGER(8), LOGICAL(8) | 8 |
| COMPLEX | Depending on default real, COMPLEX can have 8 or 16 bytes; default allocation is 8 bytes. |
| DOUBLE PRECISION, REAL(8), COMPLEX(4) | 8 |
| DOUBLE COMPLEX, COMPLEX(8) | 16 |
| CHARACTER(n) | n |
| Structures | Size of derived type (can be affected by the PACK directive) |
| RECORD | Size of record structure (can be affected by the PACK directive) |