These days you don't use the older Fortran'isams Arithmetic IF's for example and I suspect no one uses BLOCK DATA any more. But Backwards compatibly is importa

These days you don't use the older Fortran'isams Arithmetic IF's for example and I suspect no one uses BLOCK DATA any more. But Backwards compatibly is important here as there is a lot of legacy code still in use - yes I know arithmetic if has finally been removed.