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basic language for implementation of system software
・ basic multilingual plane
・ basic object adapter
・ basic object system
・ basic operating system
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・ bastard operator from hell
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basic language for implementation of system software : FOLDOC
Basic Language for Implementation of System Software
(BLISS, or allegedly, "System Software Implementation Language, Backwards") A language designed by W.A. Wulf at CMU around 1969.
BLISS is an {expression language}. It is block-structured, and typeless, with {exception handling} facilities, {coroutines}, a macro system, and a highly optimising compiler. It was one of the first non-assembly languages for operating system implementation. It gained fame for its lack of a goto and also lacks implicit dereferencing: all symbols stand for addresses, not values.
Another characteristic (and possible explanation for the backward acronym) was that BLISS fairly uniformly used backward keywords for closing blocks, a famous example being ELUDOM to close a MODULE. An exception was BEGIN...END though you could use (...) instead.
DEC introduced the NOVALUE keyword in their dialects to allow statements to not return a value.
Versions: CMU BLISS-10 fo


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