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Block structure, with underlying semantics (including recursion), similar to Algol 60.

Many principles and capabilities combined to give the language its character and were important in meeting the language's goals: To achieve these goals, PL/I borrowed ideas from contemporary languages while adding substantial new capabilities and casting it with a distinctive concise and readable syntax.

Machine independence to operate effectively on the main computer hardware and operating systems.

Improved productivity of the programming process, transferring effort from the programmer to the compiler.

Extensibility for new hardware and new application areas.

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Performance of compiled code competitive with that of Fortran (but this was not achieved).The language's scope of usefulness grew to include system programming and event-driven programming. Competitiveness with COBOL's record handling and report writing was required. The goals for PL/I evolved during the early development of the language. The Standard for PL/I was approved in 1976. The first compiler was delivered in 1966.

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These manuals were used by the Multics group and other early implementers. IBM continued to develop PL/I in the late sixties and early seventies, publishing it in the GY33-6003 manual. C28-6571" written in New York from 1965 and superseded by "PL/I Language Specifications.

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The language was first specified in detail in the manual "PL/I Language Specifications. This led in turn to one of the first large scale Formal Methods for development, VDM.įred Brooks is credited with ensuring PL/I had the CHARACTER data type. A project was set up in 1967 in IBM Laboratory Vienna to make an unambiguous and complete specification. The experience of defining such a large language showed the need for a formal definition of PL/I. The SHARE and GUIDE user groups were involved in extending the language and had a role in IBM's process for controlling the language through their PL/I Projects.

Control of the PL/I language was vested initially in the New York Programming Center and later at the IBM UK Laboratory at Hursley. IBM took NPL as a starting point and completed the design to a level that the first compiler could be written: the NPL definition was incomplete in scope and in detail. The first definition appeared in April 1964. This acronym conflicted with that of the UK's National Physical Laboratory and was replaced briefly by MPPL (MultiPurpose Programming Language) and, in 1965, with PL/I (with a Roman numeral "I"). Given the constraints of Fortran, they were unable to do this and embarked on the design of a new programming language based loosely on ALGOL labeled NPL. Scientific users group, to propose these extensions to Fortran. In October 1963 a committee was formed composed originally of three IBMers from New York and three members of SHARE, the IBM It hoped that Fortran could be extended to include the features needed by commercial programmers. Similarly, IBM wanted a single programming language for all users. The IBM System/360 (announced in 1964 and delivered in 1966) was designed as a common machine architecture for both groups of users, superseding all existing IBM architectures. Business users were moving from Autocoders via COMTRAN to COBOL, while scientific users programmed in Fortran, ALGOL, GEORGE, and others. In the 1950s and early 1960s, business and scientific users programmed for different computer hardware using different programming languages.

8.2 Significant features developed since the standard.

8.1 Significant features omitted from the standard.

5.9 PL/I compilers for personal computers and Unix.

5.7 Other mainframe and minicomputer compilers.

5.6.3 Program readability – making intentions explicit.

5.6 IBM PL/I for OS/2, AIX, Linux, z/OS.

5.3 IBM PL/I optimizing and checkout compilers.

The language syntax is English-like and suited for describing complex data formats with a wide set of functions available to verify and manipulate them. It supports recursion, structured programming, linked data structure handling, fixed-point, floating-point, complex, character string handling, and bit string handling. PL/I's main domains are data processing, numerical computation, scientific computing, and system programming. It has been used by academic, commercial and industrial organizations since it was introduced in the 1960s, and is still used. It is designed for scientific, engineering, business and system programming. PL/I ( Programming Language One, pronounced / p iː ɛ l w ʌ n/ and sometimes written PL/1) is a procedural, imperative computer programming language developed and published by IBM. Control Language, PL/M, PL/S, PL-6, PL/8, REXX