Fortran 90 (CloudMonk.io)

Fortran 90

**Fortran 90** was a major revision to FORTRAN 77. It introduced
many new features and, although it didn't delete any features, several
were identified as "obsolescent."

The full text of the Fortran 90 standard is available in
PDF format here from Fortran Standards Work Group JTC1/SC22/WG5: https://wg5-fortran.org/N001-N1100/N692.pdf

New Features

* Free form layout | Free form source input.
* Dynamic memory allocation via the `allocatable` attribute and the `allocate` and `deallocate` statements.
* Fortran Module

Old Features that had never been standardized before

* Namelist input

Obsolescent Features

None.