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BCPL and was
However, its influence is still felt because a stripped down and syntactically changed version of BCPL, called B, was the language on which the C programming language was based.
B was essentially the BCPL system stripped of any component that Thompson felt he could do without, in order to make it fit within the memory capacity of the minicomputers of the time.
B was greatly influenced by BCPL, and its name is most likely to be a contraction of BCPL.
Two implementations of KRC were written: David Turner's original one in BCPL running on EMAS, and Simon Croft's later one in C under Unix, and KRC was the main language used for teaching functional programming at the University of Kent at Canterbury ( UK ) from 1982 to 1985.
Mesa was developed on the Xerox Alto, one of the first personal computers with a graphical user interface, however most of the Alto's system software was written in BCPL.
Although the concept was first implemented circa 1966 ( as O-code for BCPL and P-a code for the Euler Language, Wirth & Weber, CACM Vol9 No2, 1966 ), the term p-code first appeared in the early 1970s.
The creator of C ++, Bjarne Stroustrup, has acknowledged that Simula 67 was the greatest influence on him to develop C ++, to bring the kind of productivity enhancements offered by Simula to the raw computational speed offered by lower level languages like BCPL.
It was rewritten as rf for the PDP-7, and at the same time ( 1969 ), Doug McIlroy rewrote an extended and simplified version of roff in the BCPL programming language.
Hungarian notation was designed to be language-independent, and found its first major use with the BCPL programming language.
Early software for the Alto was written in the programming language BCPL, and later in Mesa, which was not widely used outside PARC but influenced several later languages, such as Modula.
The entire AmigaDOS module was originally written in BCPL ( an ancestor of the C programming language ), the same language used to write TRIPOS.
Most of TRIPOS was implemented in BCPL.
In AmigaOS 1. x, AmigaDOS was based on a TRIPOS port by MetaComCo, written in BCPL.
BCPL does not use native pointers, so the more advanced functionality of the operating system was difficult to use and error-prone.
The first UNIX version was a transliteration of the BCPL version of runoff into PDP-7 assembly, for the prototype UNIX on the PDP-7, circa 1970.
In contrast with application languages, such system programming languages typically offer more direct access to the physical hardware of the machine: an archetypical system programming language in this sense was BCPL.
The O-code machine is a virtual machine that was developed by Martin Richards in the late 1960s to give machine independence to BCPL, the low-level forerunner to C and C ++.
The concept behind the O-Code machine was to create O-code output ( O stands for Object ) through the BCPL compiler.
A later language based on CPL, called BCPL ( for " Basic CPL ", although originally " Bootstrap CPL "), was a much simpler language intended primarily as a systems programming language, particularly for writing compilers.
Bob Morris and Doug McIlroy translated that from MAD assembler to BCPL ; they then moved the BCPL version to Multics when the IBM 7094 on which CTSS ran was being shut down.

BCPL and programming
BCPL ( Basic Combined Programming Language ) is a procedural, imperative, and structured computer programming language designed by Martin Richards of the University of Cambridge in 1966.
* Martin Richards designs the programming language BCPL.
* O-code of the BCPL programming language
Experiments with hardware support in high-level languages in the late 1960s led to such languages as PL / S, BLISS, BCPL, and extended ALGOL for Burroughs large systems being used for low-level programming.
* BCPL programming language – ancestor of C
* Martin Richards designs the BCPL programming language.
It gave rise to many other programming languages, including BCPL, B, Pascal, Simula, C, and many others.

BCPL and language
Ken Thompson wrote B basing it mainly on the BCPL language he had used to write Unix while in the Multics project.
Source code for a Coral 66 compiler ( written in BCPL ) has been recovered and the " Official Definition of Coral 66 " document by HMSO has been scanned ; the Ministry of Defence patent office has issued a licence to the Edinburgh Computer History project to allow them to put both the code and the language reference online for non-commercial use.
Because BCPL has no data types other than the machine word, nothing in the language itself helps a programmer remember variables ' types.
As mentioned above, Hungarian Notation expanded in such a language ( BCPL ).
According to the designers of the BCPL language, interpreted code ( in the BCPL case ) is more compact than machine code ; typically by a factor of two to one.
* Martin Richards and Colin Whitby-Strevens ( 1984 ): BCPL, the language and its compiler.
O-code is an intermediate language emitted by the BCPL compiler.

BCPL and common
Originally intended for writing compilers for other languages, BCPL is no longer in common use.

BCPL and .
Like BCPL and FORTH, B had only one datatype: the computer word.
Most assembly languages and some low-level languages, such as BCPL ( Basic Combined Programming Language ), lack support for data structures.
Third party vendors and the user community expanded the offerings with Forth, Lisp, BCPL, C, Algol, and other proprietary versions of COBOL and BASIC.
Trubshaw converted MUD to BCPL ( the predecessor of C ), before handing over development to Richard Bartle, a fellow student at Essex University, in 1980.
High-level languages which are untyped include BCPL and some varieties of Forth.
Thompson rewrote QED in BCPL for Multics.
The company also sold the Lattice C compiler for the Sinclair QL and the Atari ST and range of other languages ( e. g. Pascal, BCPL ) for m68k-based computers.

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