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BCPL    
(Basic CPL) A British systems language developed by
Richards in 1969 and descended from {CPL} (Combined
Programming Language). BCPL is low-level, typeless and
block-structured, and provides only one-dimensional {arrays}.
Case is not significant, but conventionally reserved words
begin with a capital. Flow control constructs include:
If-Then, Test-Then-Else, Unless-Do, While-Do, Until-Do,
Repeat, Repeatwhile, Repeatuntil, For-to-By-Do, Loop, Break
and Switchon-Into-Case-Default-Endcase. BCPL has conditional
expressions, pointers, and manifest constants. It has both
procedures: 'Let foo(bar) Be command' and functions: 'Let
foo(bar) = expression'. 'Valof $(..Resultis..$)' causes a
compound command to produce a value. Parameters are
{call-by-value}.

Program segments communicate via the global vector where
system and user variables are stored in fixed numerical
locations in a single array.

The first BCPL {compiler} was written in {AED}. BCPL was used
to implement the {TRIPOS} {operating system}, which was
subsequently reincarnated as {AmigaDOS}.

["BCPL - The Language and its Compiler", Martin Richards &
Colin Whitby-Stevens, Cambridge U Press 1979].

See {OCODE}, {INTCODE}.

Oxford BCPL differed slightly: Test-Ifso-Ifnot, and section
brackets in place of $( $).

The original {INTCODE} {interpreter} for BCPL is available for
{Amiga}, {Unix}, {MS-DOS}
{(ftp://wuarchive.wustl.edu/systems/amiga/programming/languages/BCPL/)}.

A BCPL compiler {bootstrap} kit with an {INTCODE}
{interpreter} in {C} was written by Ken Yap
.

(1995-03-26)

Basic / BBN Combined Programming Language (BBN)


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