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Modern Fortran by Walter Spector, Norman S. Clerman

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15.Updating Old Programs

Over the years, the Fortran standards committee has striven to keep each new standard backward-compatible with previous releases. Fortran is one of the oldest high-level languages; much old code is still in use. The committee has admirably succeeded, and programmers have known that they could continue to write programs that contained old features and that they could add features of the new standards whenever it was convenient, useful, or appropriate. Each new standard has marked only a few old features as “obsolescent,” defined as “A feature that is considered redundant but that is still in frequent use.” Those so marked in one standard may be “deleted” in a subsequent one. The standard describes a “deleted” feature as ...

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