How did PL/I originate?
PL/I came into being as a result of an attempt to produce a revision of FORTRAN in about 1964. Such were the changes necessary that it was not possible to introduce the new features needed to bring FORTRAN up-to-date, and to be compatible with existing programs, that it was decided to introduce a new language that incorporated the best features of the then main languages FORTRAN, COBOL, and Algol. Originally, the new language was called “New Programming Language”, or NPL. However, as these initials were already taken by the National Physics Laboratory in Britain, the name became PL/I (for Programming Language One). First introduced in 1966, the new language contained features not then seen before in a general-purpose programming language — including interrupt handling, array operations, list processing, and a macro pre-processor. There is some controversy over the name — whether it is PL/I or PL/1. The first manuals (for the first compiler, the IBM PL/I (F) compiler) called it PL/I,
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