..., the default for UNFORMATTED access is 4-byte units of RECL=. This has been the mode of ... the F77 standard's use of the term "storage units" being interpreted as "numerical storage units" - that is, the size of an INTEGER or REAL. In Fortran 2003, the ... forget the exact wording). F2003 also has ISO_FORTRAN_ENV to supply the actual file storage unit size in bits. Hopefully, this will be commonly available in the near future....

... the opposite! Since you're using CVF, the default for UNFORMATTED access is 4-byte units of RECL=. This has been the mode of DEC compilers for more than 30 years and comes from the F77 standard's use of the term "storage units" being interpreted as "numerical storage units" - that is, the size of an INTEGER or REAL. In Fortran 2003, the standard still allows this but recommends the use ...

...> just the opposite! Since you're using CVF, the default for UNFORMATTED access is 4-byte units of RECL=. This has been the mode of DEC compilers for more than 30 years and comes from the F77 standard's use of the term "storage units" being interpreted as "numerical storage units" - that is, the size of an INTEGER or REAL. In Fortran 2003, the standard still allows this but recommends the use of...

... that is standard conforming, it has a huge number of caveats, some of them subtle. Namely a) The result is in storage units, which are most commonly, but not always, bytes. For portability, you can do a separate inquire with data of known size to deduce what the storage unit size is (or there's the f2003 named constant for that). b) A subtle one that bit me once. For what...

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... (Richard Maine) wrote: (snip) For an unformatted file, RECL is in units of file storage units. Always. There is no uncertainty about that either. Problem in unformatted direct access! My F77 compiler has file storage units of bytes and RECL assumes bytes. My CVF...is in bytes, for FORM='UNFORMATTED' they are in 'numeric storage units (four bytes).' (For a byte addressable 16 bit machine.)...

... a formatted file, RECL is in units of default characters.  Always. There is ...uncertainty. Clear. For an unformatted file, RECL is in units of file storage units. Always. There is no ...! My F77 compiler has file storage units of bytes and RECL assumes ...CPU and operating system. You might even consider my file storage actual units to be full segments, ...problem is the meaning of "file storage units" to different compilers for the...