Language Processors
Multiprogramming was made possible by

operating systems
input/output units that operate independently of the CPU
neither (a) nor (b)
both (a) and (b)

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Language Processors
In analyzing the compilation of PL/I program, the term "Lexical analysis" is associated with

creation of more optional matrix
recognition of basic syntactic constructs through reductions
recognition of basic elements and creation of uniform symbols
use of macro processor to produce more optimal assembly code

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Language Processors
The function(s) of the Storage Assignment is/are:

to assign storage to literals, and to ensure that the storage is allocated and appropriate locations are initialized
to assign storage to all variables referenced in the source program
All of these
to assign storage to all temporary locations that are necessary for intermediate results

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