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 &
.
Basic /
BBN Combined Programming Language (
BBN )
BCPL : //,
n . [
abbreviation , “
Basic Combined Programming Language ”)
A programming language developed by Martin Richards in Cambridge in 1967 .
It is remarkable for its rich syntax ,
small size of compiler (
it can be run in 16k )
and extreme portability .
It reached break -
even point at a very early stage ,
and was the language in which the original hello world program was written .
It has been ported to so many different systems that its creator confesses to having lost count .
It has only one data type (
a machine word )
which can be used as an integer ,
a character ,
a floating point number ,
a pointer ,
or almost anything else ,
depending on context .
BCPL was a precursor of C ,
which inherited some of its features .
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