AbstractAlthough Fortran is not a pleasant language to use, it does have the advantages of universality and (usually) relative efficiency. The RATFOR language attempts to conceal the main deficiencies of Fortran while retaining its desirable qualities, by providing decent control flow statements and some ‘syntactic sugar’. RATFOR is implemented as a preprocessor which translates this language into FortranOnce the control flow and cosmetic deficiencies of Fortran are hidden, the resulting language is remarkably pleasant to use. RATFOR programs are markedly easier to write, and to read, and thus easier to debug, maintain and modify than their Fortran equivalentsIt is readily possible to write RATFOR programs which are portable to other environments. RATFOR is written in itself in this way, so it is also portable; versions of RATFOR are now running on computers of six different manufacturersThis paper discusses design criteria for a Fortran preprocessor, the RATFOR language and its implementation, and user experie
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