Ratfiv is an enhanced version of the Ratfor programming language, a preprocessor for Fortran designed to give it C-like capabilities. Fortran was widely used for scientific programming but had very basic control-flow primitives ("do" and "goto") and no "macro" facility which limited its expressiveness.The name of the language is a pun (Ratfor (RATional FORtran) -> "Rat Four" -> "Rat Five" -> RatFiv).Ratfiv was developed by Bill Wood at the Institute for Cancer Research, Philadelphia, PA in the early 80's and released on several DECUS (Digital Equipment Users Group) SIG (Special Interest Group) tapes. It is based on the original Ratfor by B. Kernighan and P. J. Plauger, with rewrites and enhancements by David Hanson and friends (U. of Arizona), Joe Sventek and Debbie Scherrer (Lawrence Berkeley National Laboratory).

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