| Language Feature | Limit |
|---|---|
| Maximum number of iterations performed by DO loops with loop control, with index variable of type INTEGER(n) for n = 1, 2 or 4 | (2**31)-1 |
| Maximum number of iterations performed by DO loops with loop control, with index variable of type INTEGER(8) | (2**63)-1 |
| Maximum character format field width | (2**31)-1 |
| Maximum length of a format specification | (2**31)-1 |
| Maximum length of Hollerith and character constant edit descriptors | (2**31)-1 |
| Maximum length of a fixed-form statement | 6 700 |
| Maximum length of a free-form statement | 6 700 |
| Maximum number of continuation lines | n/a (1) |
| Maximum number of nested INCLUDE lines | 64 |
| Maximum number of nested interface blocks | 1 024 |
| Maximum number of statement numbers in a computed GOTO | 999 |
| Maximum number of times a format code can be repeated | (2**31)-1 |
| Allowable record numbers and record lengths for input/output files in 32-bit mode | The record number can be up to (2**63)-1 if you use Version 4.2 or higher levels of the AIX operating system (which support files larger than 2 GB). The maximum record length is (2**31)-1 bytes. |
| Allowable record numbers and record lengths for input/output files in 64-bit mode | The record number can be up to (2**63)-1 and the record length can be up
to (2**63)-1 bytes.
However, for unformatted sequential files, you must use the uwidth=64 run-time option for the record length to be greater than (2**31)-1 and up to (2**63)-1. If you use the default uwidth=32 run-time option, the maximum length of a record in an unformatted sequential file is (2**31)-1 bytes. |
| Allowable external unit numbers | 0 to (2**31)-1 (2) |
| Maximum numeric format field width | 2 000 |
| Maximum number of concurrent open files | 2 000 (3) |