资料来源 : Free On-Line Dictionary of Computing

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)