PASCAL user manual and report
Computer
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Extensions to a programming language are often introduced by individual implementors for a variety of reasons. In some cases, a new construct may allow the programmer to take advantage of a unique hardware or software feature in the specific system. In other cases, the application for which the language is frequently employed may warrant simpler and more efficient constructs. Whatever the motive, extensions, in general, severely limit portability of programs. Often it is necessary to manually translate non-standard features before a program can be successfully adapted to a new environment. If we must live with such extensions at all, ideally we would like to be able to translate all extensions automatically to make the adaptation expedient and reliable.